Hengstenberg, Hans-Eduard
Munchen Anton Pustel 1963
Buku Teks
Ruse, Michael, author
Routledge, 1994
Buku Teks
Darwin, Charles, author
New York The Modern Library [date of publication not identified],
Buku Teks
Mayr, Ernst, author
Harvard University Press, 1999
Buku Teks
Beltz verlag, 1979
Buku Teks