First Gift: The Language Coach and Virtual Shop arrive on iOS - Duolingo
Duolingo: Gamified language learning — Catherine de Lange
Coach | Duolingo Wiki | Fandom
Duolingo: how they nailed their product and became the #1 education app
PDF) Interactivity in Language Learning Applications: A case study based on Duolingo
First Gift: The Language Coach and Virtual Shop arrive on iOS - Duolingo
Review — Fluent Language Blog
DuoLingo - an app that makes language learning easy
Duo | Duolingo Wiki | Fandom
I finished the god damn German tree (Duolingo) | simopr
How Duolingo's Experience Makes Language Learning Fun | FutureVision | R/GA
Duolingo told so. - Home | Facebook
Important Notice About Time Zones - Duolingo
Free Language-Learning App Duolingo Introduces Language Coach And Virtual Store
Duolingo — MadeWithUs
My experience using the Duolingo German language course - Pat Howe's Blog
Change Daily Goal - Duolingo
Duolingo Product Review. When learning a language — or mostly… | by Sofia Tahanova | Medium
100 Days of Duolingo! How I finally managed to achieve that elusive 100 day streak! | Rise of the Polyglot
Duolingo Review: The Quick, Easy and Free Way to Learn A Language - Fluent in 3 months - Language Hacking and Travel Tips
Duolingo 'incubator' aims to crowdsource language teaching - CNN
