Dyke, Vernon van, author
Stanford University Press, 1962
Buku Teks
Grimes, Alan P., author
Oxford University Press , 1959
Buku Teks
Ebenstein, William, author
Holt, Rinehart and Winston, 1962
Buku Teks
Lasswell, Harold D.
Routledge & Kegan Paul Ltd., 1949
Buku Teks
Ebenstein, William, author
Rinehart, 1960
Buku Teks