Butzer, Karl W.
Cambridge University Press, 1982
Buku Teks
Macfadyen, A.
Pitman Publishing Corporation, 1963
Buku Teks
Boughey, Arthur S.
McMillan Publisher, 1975
Buku Teks
Kendeigh, S. Charles
Prentice-Hall, 1975
Buku Teks
Lythgoe, J.N.
Oxford University Press, 1979
Buku Teks