I used mp3 downloaded from book2.de webside, but this app for IPad is the best at all. You can chose so many languages to learn, you can choose so many diferent ways to learn. It doesn't matter if you prefere wroten words, flash cards, audio materials etc. Here, in one place you've got all-in-one! I startes with greek now, continue french and spanish, and I kan choose the language from which I want to learn as for example - norwegian, which I use at work only. So I'm studying to languages at the same time. For me it's absolutelly PERFECT!!! Just try, and you will love this app :)