Feiring, Bruce R.
Sage University Paper, 1986
Buku Teks SO
Ignizio, James P.
Sage, 1985
Buku Teks SO
Campbell, Hugh G.
Prentice-Hall, 1977
Buku Teks SO
Thie, Paul R.
John Wiley & Sons, 1979
Buku Teks SO
An-Min, Chung
Charles E. Merill Publishing CO., [;1963;1963, 1963]
Buku Teks SO