Lucas, John
The Harvester Press, 1980.
Buku Teks
Academic Press, 2014
eBooks
Martin, Jay, author
Prentice-Hall, 1967
Buku Teks
Kotler, John P.
Gramedia Pustaka Utama, 1997
Buku Teks
Hellwig, Tineke, author
Centers for South and Southeast Asia Studies University of California at Berkeley , 1994
Buku Teks