Stiling, Peter D.
Prentice Hall Inc., 1999
Buku Teks
Kumar, H.D.
House PVT LTD, 1992
Buku Teks
Buchsbaum, Ralph
The Boxwood Press, 1970
Buku Teks
McIntosh, Robert P.
Cambridge University Press, 1988
Buku Teks
National Institute of Ecology and International Scientific, 1982
Buku Teks