Kerridge, Ian, author
Social Science Press, 1998
Buku Teks
edited by Marco Grix, Tim Dare
Emerald, 2016
eBooks
Bart Streumer.
Wiley-Blackwell , 2014
Buku Teks
Kagan, Shelly, author
Westview Press, 1997
Buku Teks
Weiss, Joseph, author
Wadsworth, 2009
Buku Teks