Owen-Smith, R. Norman
Cambridge University Press, 1988
Buku Teks
Schmidt-Nielsen, Knut
Cambridge University Press, 1989
Buku Teks
Dyson, Sue
Sheldon Press, 1991
Buku Teks
Allee, W.C.
John Wiley & Sons, 1963
Buku Teks
Southwood, T.R.E.
Chapman and Hall, 1968
Buku Teks