Trainor, F. R.
John Wiley & Sons, 1978
Buku Teks SO
Hoek, C. van den
Cambridge University Press, 2002
Buku Teks SO
Sharma, O.P., 1953-
McGraw-Hill, 1986
Buku Teks SO
Graham, Linda E.
Prentice-Hall, 2000
Buku Teks SO
Bold, Harold Charles, 1909-
Prentice-Hall, 1985
Buku Referensi