Rosenberg, Jerry M.
John Wiley & Sons, 1987
Buku Referensi
King, Peter J.B.
Prentice-Hall, 1990
Buku Teks SO
Silverman, Gordon
McGraw-Hill, 1988
Buku Teks
Lytel, Allan
D.B. Taraporevala Sons, 1969
Buku Teks
Lytel, Allan
Howard W. Sams, 1974
Buku Teks SO