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Duolingo, CAPTCHA co-founder Luis von Ahn wins prestigious Lemelson-MIT prize. (2018). Retrieved from https://www.nbcnews.com/news/latino/duolingo-captcha-co-founder-luis-von-ahn-wins-prestigious-lemelson-n908586
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The Tenets of A/B Testing from Duolingo’s Master Growth Hacker. (2018). Retrieved from http://firstround.com/review/the-tenets-of-a-b-testing-from-duolingos-master-growth-hacker/
The United States of Languages: An analysis of Duolingo usage state-by-state | Making Duolingo Blog. (2018). Retrieved from http://making.duolingo.com/the-united-states-of-languages-an-analysis-of-duolingo-usage-state-by-state
What is Duolingo for Schools?. (2018). Retrieved from https://support.duolingo.com/hc/en-us/articles/218111443-What-is-Duolingo-for-Schools-
When Duolingo was young: the early years. (2018). Retrieved from http://vator.tv/news/2018-06-22-when-duolingo-was-young-the-early-years
Which countries study which languages, and what can we learn from it? | Making Duolingo Blog. (2018). Retrieved from http://making.duolingo.com/which-countries-study-which-languages-and-what-can-we-learn-from-it
Babbel.com. (2018). Retrieved from https://home.babbel.com/prices?utf8=%E2%9C%93&learn_lang_iso=POR
Crowther, D., Kim, K. M., & Loewen, S. (2017). The Implementation of ISLA in MALL Technology: An Investigation into the Potential Effectiveness of Duolingo. MSU Working Papers in Second Language Studies, 8(1).
Duolingo, CAPTCHA co-founder Luis von Ahn wins prestigious Lemelson-MIT prize. (2018). Retrieved from https://www.nbcnews.com/news/latino/duolingo-captcha-co-founder-luis-von-ahn-wins-prestigious-lemelson-n908586
Duolingo's Competitors, Revenue, Number of Employees, Funding and Acquisitions - Owler Company Profile. (2018). Retrieved from https://www.owler.com/company/duolingo
Duolingo English Test. (2018). Retrieved from https://englishtest.duolingo.com/resources
Duolingo hires its first chief marketing officer as active user numbers stagnate but revenue grows. (2018). Retrieved from https://techcrunch.com/2018/08/01/duolingo-hires-its-first-chief-marketing-officer-as-active-user-numbers-stagnate/
Duolingo on Track for IPO in a Couple of Years, CEO Says. (2018). Retrieved from https://www.youtube.com/watch?v=RmAI0CS9e3s
Duolingo Review - How Does It Work? - Lingholic. (2018). Retrieved from https://www.lingholic.com/reviews/duolingo/
Education Apps Market Rising at 27.46% CAGR by 2022. (2018). Retrieved from https://www.prnewswire.com/news-releases/education-apps-market-rising-at-2746-cagr-by-2022-681497361.html
Effortless language learning — ETH alumnus Severin Hacker talks about Duolingo in an interview. (2018). Retrieved from http://www.alumni.ethz.ch/en/news-and-media/news/2015/11/effortless-language-learning%20.html
Fast-Growing Duolingo Caps Off A Big Year With The Crunchie For “Best Education Startup”. (2018). Retrieved from https://techcrunch.com/2014/02/11/fast-growing-duolingo-caps-off-a-big-year-with-the-crunchie-for-best-education-startup/
Google Play Store Best Apps of 2013. (2018). Retrieved from https://play.google.com/store/apps/collection/promotion_3000540_bestapp_apac
Google Trends Compare: Duolingo, Babbel, Memrise, Voxy, Rosetta Stone. (2018). Retrieved from https://trends.google.com/trends/explore?date=2008-09-01%202018-10-01&q=duolingo,babbel,memrise,voxy,rosetta%20stone
How Duolingo achieved a 50:50 gender ratio for new software engineer hires | Making Duolingo Blog. (2018). Retrieved from http://making.duolingo.com/how-duolingo-achieved-a-5050-gender-ratio-for-new-software-engineer-hires
How Duolingo is disrupting language learning with free app. (2018). Retrieved from https://www.cnbc.com/video/2018/05/23/ceo-of-duolingo-live-from-pittsburgh-.html
Huynh, D., & Iida, H. (2017). An Analysis of Winning Streak's Effects in Language Course of “Duolingo”. Asia-Pacific Journal of Information Technology and Multimedia, 6(2).
Konrad, A. (2018). Language App Duolingo Raises $20M In Race To Teach English. Retrieved from https://www.forbes.com/sites/alexkonrad/2014/02/18/language-learning-app-duolingo-raises-20m-in-race-to-teach-english/
Lau, T. (2018). A Review of Duolingo: Is it Really Worth Your Time?. Retrieved from http://blog.cambridgecoaching.com/learning-a-foreign-language-a-review-of-duolingo
Memrise - Memrise Pro - Memrise. (2018). Retrieved from https://www.memrise.com/premium/?source=index_page
Money Talks: Duolingo Raises $25M More (at a $700M Valuation) - EdSurge News. (2018). Retrieved from https://www.edsurge.com/news/2017-07-25-money-talks-duolingo-raises-25m-more-at-a-700m-valuation
Munday, P. (2017). Duolingo. Gamified learning through translation. Journal of Spanish Language Teaching, 4(2), 194-198.
Nawal, A., & Nawal, A. (2018). Duolingo Business Model | How Does Duolingo Make Money?. Retrieved from https://www.feedough.com/duolingo-business-model-how-does-duolingo-make-money/
Owler Reports - Duolingo: The CEO of a $700 million company uses a simple sentence to turn lazy employees around. (2018). Retrieved from https://www.owler.com/reports/duolingo/duolingo--the-ceo-of-a--700-million-company-uses-a/1530374160697
Roberts, N. (2018). He Sold Two Companies To Google, Won A MacArthur 'Genius Grant' And Launched Free Duolingo App. Retrieved from https://www.forbes.com/sites/ninaroberts/2017/05/24/he-sold-two-companies-to-google-won-a-macarthur-genius-grant-and-launched-free-duolingo-app/#4b9eadb0f87c
Seave, A. (2018). In The Battle Of Online Language Learning Programs, Who Is Winning?. Retrieved from https://www.forbes.com/sites/avaseave/2016/09/23/in-the-battle-of-online-language-learning-programs-who-is-winning/#2e2f760e578b
Simonite, T. (2018). The Cleverest Business Model in Online Education. Retrieved from https://www.technologyreview.com/s/506656/the-cleverest-business-model-in-online-education/
Smith, R. (2018). Duolingo Approaches Tech Unicorn Status. Retrieved from https://www.fool.com/investing/2017/08/06/duolingo-approaches-tech-unicorn-status.aspx
The Tenets of A/B Testing from Duolingo’s Master Growth Hacker. (2018). Retrieved from http://firstround.com/review/the-tenets-of-a-b-testing-from-duolingos-master-growth-hacker/
The United States of Languages: An analysis of Duolingo usage state-by-state | Making Duolingo Blog. (2018). Retrieved from http://making.duolingo.com/the-united-states-of-languages-an-analysis-of-duolingo-usage-state-by-state
What is Duolingo for Schools?. (2018). Retrieved from https://support.duolingo.com/hc/en-us/articles/218111443-What-is-Duolingo-for-Schools-
When Duolingo was young: the early years. (2018). Retrieved from http://vator.tv/news/2018-06-22-when-duolingo-was-young-the-early-years
Which countries study which languages, and what can we learn from it? | Making Duolingo Blog. (2018). Retrieved from http://making.duolingo.com/which-countries-study-which-languages-and-what-can-we-learn-from-it