O`Shea, Robert P. (Robert Paul), 1953-
Harcourt Brace Jovanovich, 1993
Buku Teks
Fairbairn, Gavin
McGraw-Hill, 2012
Buku Teks SO
Sternberg, Robert J.
Cambridge University Press, 2003
Buku Teks
Ingram, Beverly
Cambridge University Press , 1988
Buku Teks SO
Barrass, Robert
Routledge, 1995
Buku Teks