Artikel Jurnal
Davis, Sandra, author
Sweet & Maxwell, 1993
Buku Teks
Fall, Bernard B.
Frederick A. Praeger , 1966
Buku Teks
Van Arkadie, Brian, author
Asia Pacific Press at the National Library of Australia, 2004
Buku Teks
Steel, Danielle, author
Gramedia, 2005
Buku Teks