Hamburg, Morris, author
Harcourt Brace Jovanovich, Pub., 1991
Buku Teks
Johnson, Richard A., author
Pearson Education International, 2007
Buku Teks
Diamond, Solomon
Basic Book , 1959
Buku Teks
Universitas Indonesia, 2006
UI - Skripsi (Membership)
editor, Michael S. Lewis-Beck
Sage Publications, Toppan Publishing, 1993
Buku Referensi