Alan Melville
Prentice-Hall, 2001
Buku Teks
Goverment Information Office, 2002
Buku Referensi
edited by Aisha Hasanovic
Images Publishing, 2006
Buku Teks
The International Engineering Consortium
Professional Education International, 2000
eBooks
Makarim Wibisono [and others]
The Permanent Mission of the Repubilc of Indonesia to the Uniterd Nations, 2001
Buku Teks