Dodge, Eric R
McGraw-Hill, 2005
Buku Teks
Brown, Larry Dale
Research and Education Association, 1994
Buku Teks
Moran, Margaret C.
Peterson's, 2007
Buku Teks
Abdul Haris Utiarahman
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2015
UI - Skripsi (Membership)
Dresher, H. Michael
Springer Publishing Company, 2017
Buku Teks