Bolin, Luis A.
Alfred A. Knopf , 1962
Buku Teks
Park, Joe
Macmillan, [date of publication not identified]
Buku Teks
Sutherland, Mary
Kodansia International, 1980
Buku Teks
Coble, Parks M.
Harvard University Press, 1980
Buku Teks
Thomas, Mandy, editor
NSW National Parks and Wildlife Service, 2002
Buku Teks