Cherikoff, Vic. The bushfood handbook.
Isaaca, Jennifer. Bush food; aboriginal food and herbal medicine.
Smith, Keith & Irene. Grow your own bushffods.
Low, Tim. Wild food plants of Australia.
Cribb, A.B & J.W. Wild food in Australia.
Natusch, Shiela. Wild fare for wilderness foragers. (New Zealand)
The 2 in bold are my favourites.