The reference books and databases below will give you a basic outline about many species and taxa. They will not cover everything you need, but are a good start for your research. Many of them will offer references for further information. Grzimak's in particular provides citations to articles about the each species and taxa.
You can search for monographs (non-reference books) about taxa and species in the Fox Hunt box on the left. There also may be some additional reference books in your results.
The web resources are all trustworthy and provide basic information as well as references to other sources of information.
You can seek out scholarly & peer-reviewed sources on the "Search for Articles" tab.