edited by Anthony Gale, Michael W. Eysenck
John Wiley & Sons, 1992
Buku Referensi
Carlson, Neil R.
Pearson/Allyn & Bacon, 2007
Buku Teks SO
Carlson, Neil R.
Pearson-Prentice Hall, 2005
Buku Teks SO
Carlson, Neil R.
Allyn and Bacon, 2005
Multimedia
Blackburn, Julian
Routledge & Kegan Paul, 1953
Buku Teks SO