Arnold , 1996
Buku Teks
Nettleton, Sarah.
Polity Press, 1995
Buku Teks
Goode, William J.
Tata McGraw-Hill, 1977
Buku Teks
Paul F. Lazarsfeld ... [and others]
Basic Books, 1967
Buku Teks
Champman, Christine M., author
Bailliere Tindall, 1982
Buku Teks