If you don't know where to start, you may want to try one of the following online compilations of reference tools:
Gale Virtual Reference Library ; Includes encyclopedic articles on historical and contemporary Natie American research topics. Note; It may be necessary to click on Gale products more than once before they open!
Oxford Reference Online : Contains online versions of dictionaries and encyclopedias previously published in paper by the Oxford University Press.
Sage Reference Online : Includes numerous encyclopedias and handbooks, primarily in the Social Sciences.