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Evaluating the reading and listening outcomes of beginning‐level Duolingo courses - Jiang - 2021 - Foreign Language Annals - Wiley Online Library
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Amazon.com: Babbel Language Learning Software - Learn to Speak Spanish, French, English, & More - 14 Languages to Choose from - Compatible with iOS, Android, Mac & PC (24 Month Subscription) : Software
A systematic review examining the efficacy of commercially available foreign language learning mobile apps
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