Companion encyclopedia of psychology; Vol 1
edited by, Andrew M. Colman
Routledge, 1994
 Buku Referensi
Companion encyclopedia of aechaeology; Vol. 2
edited by Graeme Barker
Routledge, 1999
 Buku Referensi
Encyclopedia of psychology; Vol. 4
edited by Raymond J. Corsini
John Wiley & Sons, 1994
 Buku Referensi
Encyclopedia of social psychology : 2
Roy F. Baumeister, Kathleen D. Vohs, editors
Sage Publications, 2007
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Encyclopedia of mathematics Vol. 2
Kluwer Academic Publishers, 1995,
 Buku Referensi