edited by John Baylis and Steve Smith
Oxford University Press, 2006
Buku Teks
John Baylis, Steve Smith, Patricia Owens.
Oxford University Press, 2014
Buku Teks
Reynolds, P.A., author
Longman, 1994
Buku Teks
Roskin, Michael G., author
Pearson/Prentice Hall, 2004
Buku Teks
Kaufman, Joyce P, author
Littlefield Publishers, 2013
Buku Teks