Catalan course in English : r/duolingo

Learn Catalan - 5,000 Phrases - Apps on Google Play

How far can Duolingo take your language skills? - Quora

How advanced is your language after completing the Duolingo tree? Can you read in that language now? - Quora

Review — Fluent Language Blog

Spanish Pronunciation Tips for Every Learner

Duolingo - Wikipedia

9 years on Duolingo - Duolingo Forum

Language course, Duolingo Wiki

Duolingo - We've started building a course for Welsh! Though we can't guarantee how long it'll be before you can pronounce Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch. :)

Duolingo app as a resource to english teaching and learning