Shepherd, William G.
Prentice-Hall, 1979
Buku Teks SO
Myers, Danny
Taylor and Francis, 2009
Buku Teks SO
Shutt, R.C.
Longman Scientific and Technical, 1995
Buku Teks SO
Tremblay, Victor J.
Springer, 2012
eBooks
Ofori, George
Singapore University Press, 1990
Buku Teks