Carlson, Neil R.
Pearson-Prentice Hall, 2005
Buku Teks SO
Davison, Gerald C.
John Wiley and Sons, 1998
Buku Teks
Carlson, Neil R.
Pearson Education, Inc., 2002
Buku Teks
edited by Daniel P. Kimble and Andrew M. Calman
Harlow Longman, 1995
Buku Teks
Blackburn, Julian
Kegan Paul, Trench, Trubner, 1947
Buku Teks SO