Pinsky, Robert
Farrar Straus and Giroux, 2000
Buku Teks
Goldman, William, author
A Dell Book, 1960
Buku Teks
edited by Mark Collins ; foreword by David Attenborough
Oxford University Press, 1990
Buku Teks
Whitmore, T.C., author
Clarendon Press, 1990
Buku Teks
Veevers-Carter, W., author
Oxford University Press , 1984
Buku Teks