Badawi, El-Said, author
Routledge, 2004
Buku Referensi
Kurtz, Max
McGraw-Hill, 1969
Buku Teks
Liaw, Yock Fang, 1936-, author
Times Books International, 2002
Buku Teks
Wheeler, Daniel W., author
Jossey-Bass, 2012
Buku Teks
Harris, Maxwell Henley, author
National Library of Australia, 1996
Buku Teks