Bradburn, Norman, author
Jossey-Bass, 2004
Buku Teks
Crane, Jody, author
CRC Press, 2011
Buku Teks
New Riders, 2005
Buku Teks
Nokes, Sebastian, author
Pearson Education, 2007
Buku Teks
Kydd, Andrew H., 1963-, author
Cambridge University Press, 2015
Buku Teks