Hoffman, Laurence D., author
McGraw-Hill, 1975
Buku Teks
Barnett, Raymond A., author
Dellen Publishing, 1981
Buku Teks
Attenborough, David
BBC Worldwide Limited, 2005
Multimedia
TenHouten, Warren D., author
Routledge, 2009
Buku Teks
edited by Marilynn B. Brewer and Miles Hewstone
Blackwell, 2004
Buku Teks