Roller, David
Gramedia, 1995
Buku Teks
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1995
UI - Skripsi Membership
Argane, Robert
Restu Agung, 2005
Buku Teks
by Roger A. Kerin ... [and others]
McGraw-Hill, 2002
Buku Teks
Etzel, Michael J.
McGraw-Hill, 2004
Buku Teks