Medlik, S
Butterworth-Heinemann, 2000
Buku Teks
Novi Romauli, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2015
UI - Skripsi (Membership)
edited by martin Nicholas Kunz
teNeues, 2003
Buku Teks
Dittrich, Guy, editor
teNeues, 2006
Buku Referensi
Ypma, Herbert, author
Thames & Hudson, 1999
Buku Referensi