edited by Frank W. Schneider, Jamie A. Gruman, Larry M. Coutts
Sage , 2012
Buku Teks
edited by Gun R. Semin, Klaus Fiedler
Sage, 1996
Buku Teks
Oskamp, Stuart, author
Prentice-Hill, 1984
Buku Teks
Krech, David, author
McGraw-Hill, 1948
Buku Teks
edited by Leonard Bickman
Sage, 1982
Buku Teks