Rothenberg, Robert E, author
The Danbury Press, 1976
Buku Teks
Shucksmith, Janet, author
Routledge, 1998
Buku Teks
Sage Publications, 2000
Buku Teks
Mead, Margaret, author
The New American Library, 1953
Buku Teks
Anderson, Ian, author
Media masters publishing sdn. bhd., 2011
Buku Referensi