Keller, Edward A.
Prentice-Hall, 1996
Buku Teks
Sutherland, Lin
University of New South Wales Press, 1995
Buku Referensi
Ballard, Robert D.
National Geographic Society, 1983
Buku Referensi
Bowler, Sue
Erlangga, 2003
Buku Teks
Briggs, J. C.
Elsevier, 1987
Buku Teks