Cook,Franklin H.
Macmillan, 1951
Buku Teks
Kerr, Thomas S., author
John Wiley & Sons, 1952
Buku Teks
Anderson, Ronald A., author
South-Western Publishing, 1975
Buku Teks
by Daniel V. Davidson [and others]
Kent, 1987
Buku Teks
J. David Reitzel [and others]
McGraw-Hill, 1990
Buku Referensi