https://www.livelingua.com/courses/Yoruba/
https://sites.google.com/a/wisc.edu/language-learning-resources-for-yoruba-2/websites : Language-Learning Resources for Yoruba
https://www.hippocrenebooks.com/store/p433/Beginner%27s_Yoruba_with_Online_Audio.html : Beginner's Yoruba with Online Audio, Hippocrene books
https://www.coerll.utexas.edu/yemi/ : Yorùbá Yé Mi, A free CC licensed textbook with audio for Yoruba