Marslan, Douglas
Holt, Rinehart and Winston, 1964
Buku Teks
Nelson, Gideon E.
John Wiley & Sons, 1984
Buku Teks
edited by John Brady
Cambridge University Press, 1982
Buku Teks
Keeton, William T.
W.W. Norton, 1967
Buku Teks
Freeman, Scott
Prentice-Hall, 2002
Buku Teks