Holloway, Robert J., author
John Wiley & Sons, 1968
Buku Teks
Hair, Joseph F., Jr., author
McGraw-Hill, 2006
Buku Teks
Heidingsfield, Myron S.
Mass Allyn and Bacon , 1968
Buku Teks
Wales, Hugh G.
The University of Illinois Press , 1951
Buku Teks
Cundiff, Edward W., author
Prentice-Hall, 1988
Buku Teks