Cohen, Nathan Edward
Holt, Rinehart and Winston, 1958
Buku Teks
Hacker, Louis M.
Columbia University Press, 1947.
Buku Teks
Hacker, Louis M.
Columbia University Press, 1947
Buku Teks
Farley, John E.
Prentice-Hall, 1987
Buku Teks
by Thomas L. Hartshorne ... [and others]
Longman, 2003
Buku Teks