McGraw-Hill, 2000
Buku Teks
Partlow, Robert B.
Prentice-Hall, 1963
Buku Teks
edited by Benjamin B. Hoover, Donald S. Taylor
Holt, 1957
Buku Teks
edited by John L. Bradley and Martin Stevens
Rinehart and Winston, 1968
Buku Teks
Viking Press, 1958
Buku Teks