The UCLA Language Materials Project (LMP) is an on-line bibliographic database of teaching and learning materials for over 100 Less Commonly Taught Languages (LCTLs).
The website has a section called Language Profiles where you can find
information about the historical, cultural, and social roots of the language, a map showing where the language is spoken, basic facts about the grammar, writing systems, and history of the language, and a wealth of other sociolinguistic information. Each page also includes contains links to the LMP citations for that language and a list of websites of interest to teachers and learners of the language.
See the language profile for Hausa.