Howard, Jonathan
Pustaka Utama Grafiti, 1994
Buku Teks
Darwin, Charles Robert
New York Henry Schuman 1950
Buku Teks
Marshall, Jock
Hodder and Stoughton, 1970
Buku Teks
Carroll, Joseph, author
Oxford University Press, 2016
eBooks
Miller, Jonathan, author
Mizan, 2000
Buku Referensi