The AIATSIS Library (http://www.aiatsis.gov.au/library)  holds the most comprehensive collection of print materials on Australian Indigenous studies in the world.  If a trip to Canberra is not possible, you can contact them and receive assistance via phone or email. 

In addition to the catalogue of  their resources, there are also some VERY useful finding aids.  These cover such areas as biographies, social justice, Stolen Generation and substance use.   http://www.aiatsis.gov.au/library/subject_guides__bibliographies

The language bibliographies provide references for linguistic and cultural information pertaining to individual language groups.  These are very detailed – the bibliography for Jagara/Yuggera is over fifty pages!  http://www.aiatsis.gov.au/library/subject_guides__bibliographies/language_bibliographies