Mara, W P(Neptune City, NJ : T.F.H. Publications ; Lanham, MD : Distributed in the U.S. to the bookstore and library trade by National Book Network,, 1995)
Webb, Grahame; Manolis, S Charlie; Whitehead, Peter J(Chipping Norton, NSW : Published by S. Beatty & Sons in association with the Conservation Commission of the Northern Territory., 1987)