Thomas, Kenneth D.
[publisher not identified], [date of publication not identified]
Buku Klasik
Fraser, Thomas M.
Ribehart and Winston, 1966
Buku Teks
Michael D. Brown
Ann Arbor Science Publishers, 1981
Buku Teks
Massachusetts Sianauer Associates, 1991
Buku Teks
Clark, John J.
Prentice-Hall, 1979
Buku Teks