Chabot, B., author
De Bezige Bij, 1988
Buku Teks
Horwath, Ernest B., author
John Wiley & Sons, 1977
Buku Teks
Horwath, Ernest B., author
Ronald Press, 1970
Buku Teks
Ritonga, P. Kokoh P., author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1996
UI - Tesis (Membership)
Reischauer, Edwin O., author
Stanford University Press, 1953
Buku Teks