Princeton University Press, 1964
Buku Teks
Kinmel, Lewis H.
Brookings Institution , 1950
Buku Teks
edited by Max F. Millikan
Yale University Press, 1953
Buku Teks
Berle, Adolf A., Jr.
Harcourt, Brace, 1959
Buku Teks
edited by Harold M. Groves
Henry Holt and Company, 1955
Buku Teks