Rowlands, Penelope, author
Chronicle Books, 2000
Buku Referensi
Gluck, Peter L., author
Rockport Publishers, 1997
Buku Teks
Artikel Jurnal
Lidya Nafatilona, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2011
UI - Tesis (Open)
Crosbie, Michael J., author
Rockport Publishers, 1998
Buku Teks