Fitzgerald, Gerald B.
A.S.Barnes and Company, 1948
Buku Teks
Butler, George D.
McGraw-Hill Book Company, Inc., 1949
Buku Teks
Deppe, Theodore R., author
John Wiley & Sons, 1983
Buku Teks
Schaller, Lyle E., author
Abingdon Press, 1966
Buku Teks
Hayes, Robert H.
N.Y. A division of Macmillan, inc. , 1988
Buku Teks