edited by Elliot D. Cohen
Oxford University Press , 1992
Buku Teks SO
edited by Andrew Belsey and Ruth Chadwick
Routledge, 1995
Buku Teks SO
Danico, Mary Yu
Greenwood Press, 2004
Buku Teks
Artikel Jurnal
by Robert M. Bigler ... [and others]
Kendall/Hunt, 1982
Buku Teks SO