Chhalotra, G.P.,
Khanna, 1980
Buku Teks
Beaty, Wayne H., editor
McGraw-Hill Publishing Company, 1990
Buku Referensi
Carlson, A. Bruce, author
Addison-Wesley, 1981
Buku Teks
Korn, Granino A., author
McGraw-Hill, 1965
Buku Teks
Dekker, Adrianus J., author
Prentice-Hall, 1984
Buku Teks