Charles W. Eliot, edited
P. F. Collier & Son Corporation, 1959
Buku Referensi
Darwin, Charles, author
Yayasan Obor Indonesia, , 2003
Buku Teks
Darwin, Charles, author
Penguin Books, 1985
Buku Teks
Darwin, Charles, author
The Modern Library , [date of publication not identified]
Buku Teks
Ruse, Michael, author
Routledge, 1994
Buku Teks