David Mckay Company, 1966
Buku Teks
Public Interest Incorporated Association,
Majalah, Jurnal, Buletin
Artikel Jurnal
Burgess, Peter H., author
Graham Brash, 1983
Buku Referensi
Ray, Sibnarayan
Melbourne and Sydney : Thomas Nelson (Austrakia) Ltd., 1966.
Buku Teks