Raifb, Norma Radol
Sage Publications, 1993
Buku Teks
Sofia Ardhiana, author
2014
UI - Skripsi (Membership)
Institute of Southeast Asian studies, 1991
Buku Teks
by Frederick S. Hillier [and others]
McGraw-Hill, 2008
Buku Teks
Robbins, Stephen P., author
Prentice-Hall, 1997
Buku Teks