Verkuyten, Maykel
Psychology Press Taylor & Francis Group, 2005
Buku Teks SO
Bloch, Herbert A.
Alfred A. Knopf, 1952
Buku Teks
edited by Raymond Cochrane and Douglas Carrol
Falmer Press, 1991
Buku Teks
Robinson, James Harvey, 1863-1936
Harper, 1930
Buku Teks
Smith, Peter B.
Sage, 2013
Buku Teks