Lazarsfeld, Paul F., author
Elsevier Scientifc Publishing Company, Inc., 1975
Buku Teks
by Sylvia Prosser [and others]
Mosby Elsevier , 2000
Buku Teks
Burger, Henry Robert
W.W. Norton, 2006
Multimedia
Toennies, Ferdinand
The University of Chicago Press, 1971
Buku Teks
Dalven, Richard, author
Plenum Press, 1990
Buku Teks