Magabook, 1994
Buku Referensi
edited by Leigh Cato
Allen & Unwin, 1995
Buku Teks
Leigh, John
National Park and Wildlife Service, 1979
Buku Teks
English Universities Press, 1955
Buku Referensi
edited by Leonie Kramer
Oxford University Press, 1981
Buku Teks