Whittow, John B., author
Allen Lane, 1984
Buku Referensi
Goodall, Brian, author
Penguin Books, 1987
Buku Referensi
Moore, W. G., author
Penguin Books, 1974
Buku Referensi
Moore, W.G.
London : Penguin Books, 1984,
Buku Referensi
Petersen, James F., author
Brooks/Cole Cengage Learning, 2012
Buku Teks