In terms of books specifically for Jula, there are few that are currently in print or easily available.
That said, lingua franca Jula is 100% mutually intelligible with lingua franca Bambara (think British and American English or perhaps closer — here’s a write-up I did about their specific differences) so you can also easily use any print books designed Bambara.
Below are a few print and online texts that can help you learn Jula. For apps, dictionaries and other useful tools, you can also check out the Resources page.
In Print or Available Online…
Bailleul’s Cours pratique de bambara; great text from Bambara’s premier Western lexicographer of the 20th century.
Morales’s “J'apprends le bambara”; not my favorite introduction to the language but it’ll work.
Peace Corps Mali’s “Introductory Bambara Language Training Program”; Manual with chapters that each include cultural notes, vocabulary, expressions, grammar and exercises around a single communicative task.
Harder to find…
Batienon’s “Cours d’initiation : Dioula”; nice small introduction to the language; produced locally in Burkina Faso; includes a small lexicon.
Bird (et al.)
Dumestre’s “Kó dì?: Cours de dioula”; old text published out of Côte d’Ivoire with beautiful images.