Lerner, Joshua, author
John Wiley & Sons, 2012
Buku Teks
Farid. Fara Mademah Ahmad, author
Edinburgh University Press, 2012
Buku Teks
edited by Chris Hale, Carolyn Boyle, Jo Moore
Globe Business, 2010
Buku Teks
Holt, David H., author
Prentice-Hall, 1992
Buku Teks
Cooke, Darryl J., author
Sweet & Maxwell, 2011
Buku Teks