Poitertials, James T.S.
Prentice-Hall, 1965
Buku Teks
Sanguanwongwan, Kanchana
Brooker Group, 1994
Buku Teks
Masse, Pierre
Prentice-Hall, 1962
Buku Teks
A. Bimo Notowidigdo, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1999
UI - Skripsi (Membership)
Jones. C. Kenneth
McGraw-Hill, 1992
Buku Teks