Lasswell, Harold D.
Routledge & Kegan Paul Ltd., 1949
Buku Teks
Cambridge University Press, 2010
eBooks
Frohlich, Norman
Prentice-Hall, 1987
Buku Teks
Germino, Dante L., author
Rand McNally, 1972
Buku Teks
Williams, James, author
Routledge, 2000
Buku Teks