Ivey, Paul W.
Prentice-Hall, 1961
Buku Teks
Fernald, Charles H., author
Prentice-Hall, 1959
Buku Teks
Kirkpatrick, Charles A., author
South-Western Publishing, 1976
Buku Teks
Pederson, Carlton A., author
Richard D. Irwin. Inc., 1957
Buku Teks
Anderson, Lowell, author
Prentice-Hall, 1971
Buku Teks