Wiesmeth, Hans
Springer, 2012
eBooks
Askari, Hossein
John Wiley & Sons, 2015
Buku Teks SO
Pojman, Louis P.
Wadsworth and Cengage Learning, 2012
Buku Teks SO
Hackett, Steven C.
M.E. Sharpe, 2001
Buku Teks SO
Kolstad, Charles D.
Oxford University Press, 2000
Buku Teks