Clarke, Arthur C.
Harper and Row, 1965
Buku Teks
Frederick A. Praeger, 1969
Buku Teks
Stuart, Francis, 1912-
CSAAR, Division of Asian and International Studies, Griffith University, 1990
Buku Teks
Gronbach, Kenneth W., author
American Management Association, 2008
eBooks
Yuniah Ningsih, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2008
UI - Skripsi (Open)