edited by Tyler G. Hicks
McGraw-Hill, 1986
Buku Referensi
editor, David Hollis
British Museum (Natural History), 1980
Buku Referensi
editor, R.W. Sims
British Museum (Natural History), 1980
Buku Referensi
Ballast, David Kent, author
Professional Publications, Inc., 2002
Buku Referensi
Biesinger, Joseph A., author
Facts On File, 2006
Buku Teks