MacDougall, Curtis D., author
Macmilan Co., 1972
Buku Teks
Mac Dangall, Curtis D., author
Macmillan, 1967
Buku Teks
Fred Fedler ... [and others]
Fort Worth Harcourt Brace College , 1997
Buku Teks
Rich, Carole, author
Wadsworth and Cengage Learning, 2010
Buku Teks
Ahmad Muntaha, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2000
UI - Tesis Membership