Lucas, John
The Harvester Press, 1980.
Buku Teks
Martin, Jay, author
Prentice-Hall, 1967
Buku Teks
Kotler, John P.
Gramedia Pustaka Utama, 1997
Buku Teks
Macarthur, J. R.
D. Appleton-Century, 1936
Buku Teks
McLaren, John, author
Ling Wah, 1989
Buku Teks