Coughlan, Robert, author
Time Incorporated, 1962
Buku Teks
Wallace, Alfred Russel, 1823-1913, author
Cambridge University Press, 2013
Buku Teks
Tan, Hock Beng, 1962-
Page one Publishing, 1994
Buku Referensi
Givoni, Baruch, author
John Wiley & Sons, 1998
Buku Teks
Cole, Albert M.
ASM Press, 1978
Buku Teks