edited by Alan Bryman
Sage, 2001
Buku Referensi
Horton, Paul B., author
Erlangga, 1990
Buku Teks
Gadjah Mada University Press, 1989
Buku Teks
Henslin, James M., author
Erlangga, 2007
Buku Teks
Edgar F. Borgatta, editor-in-chief, Marie L. Borgatta, managing editor
Macmillan, 1992
Buku Referensi