Feldman, Robert Stephen, 1947-, author
McGraw-Hill , 1993
Buku Teks
Riggio, Ronald E., author
Pearson, 2009
Buku Teks
The British Psychological Society, 2018
Majalah, Jurnal, Buletin
The British Psychological Society, 2018
Majalah, Jurnal, Buletin
Carlson, Neil R., author
Allyn and Bacon, [date of publication not identified]
Buku Teks