edited by S.N. Eisenstadt
Little, Brown and Company, 1968
Buku Teks
Williams, Malcolm, 1953-, author
Routledge, 2000
Buku Teks
Black, James A., author
John Wiley & Sons, 1976
Buku Teks
Bryman, Alan, author
Oxford University Press, 2016
Buku Teks
McRobert, Kenneth
McClelland and stewart, 1976
Buku Teks