The following books and sites might be of interest to you.

Tiwi Wives. A Study of the Women of Melville Island, North Australia. Jane Goodale. (1971) University of Washington press

The Tiwi of North Australia. C.W.M A.R. Pilling, A.R. (1960) Holt, Rhinehart and Winston. New York

Ngawurranungurumagi Ngapangiraga Nginingawila. Jennifer Lee. (1993) The Summer Institute of Linguistics. Darwin NT.

Australian Institute of Aboriginal and Torres Strait Islander Studies

PARADISEC - The facility for digital preservation and access to endangered language and music from the Asia Pacific.

The National recording Project for Indigenous Performance in Australia

Tiwi Land Council