Jorgensen, Marianne
Sage, 2002
Buku Teks
Jorgensen, Marianne, author
Sage, 2004
Buku Teks
Scheid, Francis, author
McGraw-Hill, 1968
Buku Teks
Prima Nur Happyani, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2009
UI - Skripsi (Open)
Chan, Yupo, author
South-Western College, 2001
Buku Teks