Journal of occupational psychology
The British Psychological Society, 2018
 Majalah, Jurnal, Buletin
Journal of occupational and organizational psychology
The British Psychological Society, 2018
 Majalah, Jurnal, Buletin
Lefton, Lester A.
Psychology
Allyn and bacon , 1997
 Buku Teks
Wortman, Camille B.
Psychology
McGraw-Hill, 1992
 Buku Teks
Myers, David G.
Psychology
Worth, 1986
 Buku Teks