Callwey Verlag, 2002
Buku Teks
Bolin, Luis A.
Alfred A. Knopf , 1962
Buku Teks
Sutherland, Mary
Kodansia International, 1980
Buku Teks
Thomas, Mandy, editor
NSW National Parks and Wildlife Service, 2002
Buku Teks
Meringolo, Denise D., author
University of Massachusetts Press, 2012
Buku Teks