Paper  bibtex   

@misc{_learn_2015,
	Author = {Babbel},
	Date = {2017},
	Date-Modified = {2017-04-17 12:30:00 +0000},
	Keywords = {app, ELE, L2, L2 teaching, pronunciation teaching},
	Title = {Learn Spanish with Babbel (v. 5.6.6)},
	Url = {https://play.google.com/store/apps/details?id=com.babbel.mobile.android.es},
	Bdsk-Url-1 = {https://play.google.com/store/apps/details?id=com.babbel.mobile.android.es}}