Combs, James E., author
Macmillan, 1984
Buku Teks
edited by James C. Charlesworth
The Free Press, 1968
Buku Teks
Iver, Mc., author
Aksara Baru, 1980
Buku Teks
Mackenzie, W.J.M
Penguin books, 1978
Buku Teks
Agus Hermawan, author
Remaja rosdakarya, 2000
Buku Teks