Barkan, Steven E., author
Jones and Bartlett, 2011
Buku Teks
Andrew Ashworth, Alison Macdonald, Ben Emmerson
Sweet & Maxwell , 2012
Buku Teks
Regoli, Robert M., author
Jones and Bartlett Publishers, 2010
Buku Teks
edited by Joanne Naughton
McGraw-Hill, 2013
Buku Teks
Jones, Mark, author
Elsevier, 2012
Buku Teks