Harrison, Paul
John Wiley & Sons, 2001
Buku Teks SO
Johnson, Kenneth D.
The Benjamin, 1984
Buku Teks
Ackley, Meredith E.
Appleton-Sentury Crofts, 1965
Buku Teks
Bauer, Richard C.
McGraw-Hill, 2013
Buku Teks SO
Dickson, T.R.
John Wiley & Sons, 1983
Buku Teks SO