Bradley, Harriet, author
Polity press, 2007
Buku Teks
Mayes, Pat, author
Longman, 1986
Buku Teks
Bornstein, Robert F, author
Washington D.C, 2002
Buku Teks
Brettell, Caroline, author
Polity Press, 2016
Buku Teks
Louise Durning, Richard Wrigley, editor
John Wiley & Sons, 2000
Buku Teks