Fergusson, Erna, author
The University of New Mexico Press, 1966
Buku Teks
Rand McNally, [date of publication not identified]
Buku Referensi
Driver, Harold E.
Mouton Indiana University 1963
Buku Teks
Paz, Octavio
Grove Press, 1961
Buku Teks
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 1993
UI - Skripsi (Membership)