Mac Dangall, Curtis D.
Macmillan, 1967
Buku Teks
Fred Fedler ... [and others]
Fort Worth Harcourt Brace College , 1997
Buku Teks
Rich, Carole
Wadsworth and Cengage Learning, 2010
Buku Teks
Ahmad Muntaha
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2000
UI - Tesis Membership
Charnley, Mitchell V.
Holt, Rinehart and Wisnton, 1965
Buku Teks