Silverman, David, author
Sage , 2013
Buku Teks
Magnusson, Eva, author
Cambridge University Press, 2015
eBooks
Gaultney, Jane F., author
California, 2007
Buku Teks
Silverman, David, author
Sage, 2000
Buku Teks
edited by Nina Hallowell
Open University Press, 2005
Buku Teks