Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2005
UI - Skripsi Membership
Sorenson, Ritch, author
Prentice-Hall, 2001
Buku Referensi
Gurewich, Nathan, author
McGraw-Hill, 1992
Buku Teks
Goddard, Ken, author
The Bath Press, 1995
Buku Teks
Yerbury, Hilary, author
University of Technology, 1992
Buku Referensi