Sinclair, I. M. (Ian McTaggart) Sir, 1926-
Manchester University Press, 1973
Buku Teks
Marshall, Alan, 1902-1984
World Pub., 1955
Buku Teks
edited by, Sculley Bradley
W.W. Norton, 1967
Buku Teks
Hughes, Charles W.
Columbia University Press, 1980
Buku Referensi
Greenstein, Fred I.
Englewood Cliffs, 1970
Buku Teks