Page One Publishing, [date of publication not identified]
Buku Referensi
Ypma, Herbert, author
Thames & Hudson, 1999
Buku Referensi
Ypma, Herbert, author
Thames & Hudson, 2000
Buku Referensi
Ypma, Herbert, author
Thames & Hudson, 2000
Buku Referensi
Kotler, John P.
Gramedia Pustaka Utama, 1997
Buku Teks