edited by Harry Daniels
Routledge, 2005
Buku Teks
Karpov, Yuriy V.
Cambridge University Press, 2014
Buku Teks SO
Craven, Paul R.
Dickenson Publishing, 1968
Buku Teks
Derry, Jan
Wiley-Blackwell, 2013
Buku Teks
Gredler, Margaret E.
The Guilford Press, 2008
Buku Teks