Packenham, Robert A
Princeton University Press, 1976
Buku Teks
Brzenzunski, Zbigniew
Greenwood Press, 1970
Buku Teks
Martin, Dick, author
American Management Association, 2007
eBooks
Henni Oktaviani, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1999
UI - Skripsi (Membership)
Modelski, George, author
Frederick A. Praeger, 1962
Buku Teks