Dickey, John W.
McGraw-Hill, 1975
Buku Teks
Bruton, Michael J.
Hutchinson, 1975
Buku Teks SO
edited by John D. Edwards
Prentice-Hall, 1992
Buku Referensi
Papacostas, C. S.
Pearson/Prentice Hall, 2005
Buku Teks
Wright, Paul H.
John Wiley & Sons, 1989
Buku Teks