Refferty, Robert, author
Monthly press, 1981
Buku Referensi
Greene, Felix
Doubleday & Company, Inc., 1961
Buku Teks
Bird, Isabella Lucy
Yonsel University Press, 1970
Buku Teks
Hedin, Sven
De Nederlandsche Boekhandel, 1948
Buku Teks
Taufik Bawazier, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2001
UI - Tesis (Membership)