Gleim, George A., author
Prentice-Hall, 1971
Buku Teks
Clark, Frank J., author
Prentice-Hall, 1972
Buku Teks
Gregory, Robert Henry, author
Wadsworth, 1960
Buku Teks
Long, Larry E., author
Reston Publishing, 1979
Buku Teks
Awad, Elias M., author
Prentice-Hall, 1966
Buku Teks SO