Peter Craig, author
Learning matters Ltd., 2010
Buku Teks
David R. Mottram, editor
Routledge, 2011
Buku Teks
David L. Andrews, Ben Carrington
Wiley-Blackwell, 2013
Buku Teks
Cox, Richard H., author
McGraw-Hill, 2012
Buku Teks
LeUnes, Arnold, author
Psychology Press, 2008
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