Harman, Jeanne Perkins, author
Appleton-Century-Crofts, 1961
Buku Teks
Campbell, I. C., author
University of Queensland Press, 1989
Buku Teks
edited by Norman and Ngaire Douglas
Angus & Robertson, 1989
Buku Referensi
Sharp, Andrew, author
Clarendon Press, 1960
Buku Teks
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 1992
UI - Skripsi (Membership)