Lowe, P. H.
Pan Books, 1970
Buku Teks
Charles W. Eliot, edited
P. F. Collier & Son Corporation, 1959
Buku Referensi
The Natural History Press, 1968
Buku Teks
Saint-Laurent, George E., author
Mayfield, 2000
Buku Teks
edited by Ian S. Markham, Tinu Ruparell
Blackwell, 2001
Buku Teks