Terrell Ward Bynum, Simon Rogerson, editors
Blackwell Publishing, 2010
Buku Teks
edited by Cynthia Jeffrey
Emerald, 2016
eBooks
Foster, Illysa R.
Jones & Bartlett Learning, 2011
Buku Teks
Echenique, Javier
Cambridge University Press, 2012
Buku Teks
Pierce, Carl A.
Thomson/West, c2011.
Buku Teks