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Buku Teks SO
edited by Ronald E. Riggio and Robert S. Feldman
Lawrence Erlbaum Associates, 2005
Buku Teks SO
Ellgring, Heiner
Cambridge University Press, 2008
Buku Teks SO
edited by David Matsumoto, Mark G. Frank, Hyi Sung Hwang
Sage, 2013
Buku Teks SO
Roberts, Sam.
BBC Worldwide Limited, 2004
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