Jacobs, Marius
Springer-Verlag, 1981
Buku Teks
edited by Helmut Lieth, M.J.A. Werger and David W. Goodall
Elsevier, 1992
Buku Teks
Whitmore, T.C.
Clarendon Press, 1990
Buku Teks
Nichol, John
David & Charies, 1990
Buku Referensi
edited by Mark Collins ; foreword by David Attenborough
Oxford University Press, 1990
Buku Teks