McGraw-Hill, 2004
Buku Referensi
editor, J.E. Evetts
Pergamon Press, 1997
Buku Referensi
Stokes, Adrian V.
Wildwood House, 1986
Buku Referensi
Ketut Ariadi Kusuma, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1996
UI - Skripsi (Membership)
Steinfels, Peter
Simon and Schuster, 1980
Buku Teks