Frost, Nollaig, author
McGraw-Hill, 2011
Buku Teks
Sanders, Lalage D., author
BPS Blackwell, 2010
Buku Teks
Barker, Chris, author
John Wiley & Sons, 2002
Buku Teks
edited by Jonathan A. Smith
SAGE, 2015
Buku Teks
edited by Harry T. Reis and Charles M. Judd
Cambridge University Press, 2000
Buku Teks