Kagan, Shelly, author
Westview Press, 1997
Buku Teks
edited by Christopher Dowrick and Lucy Frith
Routledge, 1999
Buku Teks
Garrett, Thomas M., author
Prentice-Hall, 2001
Buku Teks
Bramanti Kusuma Yuwono, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2014
UI - Skripsi (Membership)
Albert, Ethel M., author
American Book Company, 1953
Buku Teks