Reamer, Frederic G., author
Columbia University Press, 1999
Buku Teks
Fisher, Colin, author
Pearson Education, 2013
Buku Teks
Editor: Souzy Dracopoulou
Routledge, 1998
Buku Teks
The Free Press, 1982
Buku Teks
Duncan, Peter, author
Sage, 2014
Buku Teks