Ethnologue Report for Hausa
Information about where Hausa is spoken and the number of its speakers.
Hausa Language
Wikipedia article.
The Hausa Language - by Paul Newman
Write-up on a reference grammar of the Hausa language, by one of the top authorities in the field, and published by Yale University Press.
Hausa Page
Guide to books, courses, software, and audiovisual resources for studying the Hausa language, from a distributor in Melbourne (Australia).
Teach Yourself Hausa
Introduction to the Hausa language, including the basics of its phonetics and grammar, and some sample sentences illustrating everyday conversation in the language.
UCLA Hausa Page
UCLA resource guide to the Hausa language and the culture of Hause speakers. Includes an online Hausa grammar.