Elifson, Kirk W., 1943-, author
McGraw-Hill, 1990
Buku Teks
Rose, Arnold M., author
Houghton Miffiln, 1962
Buku Teks
edited by Allen M. Omoto
Lawrence Erlbaum Associates, 2005
Buku Teks
Sherif, Muzafer, author
John Wiley & Sons, 1962
Buku Teks
Rudner, Richard S.
Prentice-Hall, 1966
Buku Teks