Bellas, Carl J.
Praeger, 1972
Buku Teks
Granick, David
Columbia University Press, 1954
Buku Teks
Rumantyo Hardikartika, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1981
UI - Skripsi (Membership)
Friederich, Carl J
Cornell University Press, 1957
Buku Teks
edited by Ray Wood
CCH Australia, 1978
Buku Teks