Quinn, Virginia Nichols
McGraw-Hill, 1995
Buku Teks SO
Feldman, Robert Stephen, 1947-
McGraw-Hill, 1989
Buku Teks SO
edited by Peter Warr
Panguin Books, 1978
Buku Teks SO
DuBrin, Andrew J.
Prentice-Hall, 2000
Buku Teks SO
edited by Pieter J.D. Drenth, Henk Thierry, Charles J. de Wolff
Routledge, 1998
Buku Referensi