Ruse, Michael, author
Routledge, 1994
Buku Teks
Ruse, Michael, author
Cummings Publishing Company, 1982
Buku Teks
Darwin, Charles, author
New York The Modern Library [date of publication not identified],
Buku Teks
oleh M. Rusdi ... [and others]; editor, Sindu Galba
Departemen P & K , 1989
Buku Teks
Uno, Mien R., author
Gramedia, 2005
Buku Teks