edited by Robert N. Singer, Milledge Murphey and L. Keith Tennat
Macmillan, 1993
Buku Referensi
editedby Robert N. Singer, Heather A. Hausenblas and Christopher M. Janelle
Wiley, 2001
Buku Teks SO
Eysenck, Michael W.
Psychology Press, 2005
Buku Teks SO
Soderman, Sten
Edward Elgar, 2013
Buku Teks SO
Phillips, Estelle M.
Open University Press, 1994
Buku Teks