French, Wendell L.
Harper & Row, 1985.
Buku Teks
Oskamp, Stuart
Lawrence Erlbaum , 2005
Buku Teks SO
Maio, Gregory R.
SAGE Publications, 2019
Buku Teks
Maio, Gregory R.
Sage, 2015
Buku Teks
edited by Donna Coch, Kurt W. Fischer, Geraldine Dawson
Guilford Press, 2007
Buku Teks