Sweet & Maxwell, 2005
Buku Teks
Tran, Van Doan, author
The council for research in values and philosophy, 2001
Buku Teks
Agustinus Yuventus, author
Fakultas Teknik Universitas Indonesia, 1999
UI - Skripsi (Membership)
Hooijdonk, Marieke van, author
Wolter Kluwer, 2012
Buku Teks
Koupelis, Theo, author
Jones & Bartlett learning, 2011
Buku Teks