Stopher, Peter R.
Lexington Books, 1979
Buku Teks
Lofland, John
Wadsworth, 1984
Buku Teks SO
Baruss, Imants
American Psychological Association, 2003
Buku Teks SO
edited by Cheryl Haslam and Alan Bryman
Routledge , 1994
Buku Teks SO
Hanushek, Eric A.
Academic Press, 1977
Buku Teks SO