Wiesmeth, Hans
[Springer, Springer], 2012
eBooks
Askari, Hossein
John Wiley & Sons, 2015
Buku Teks
Pojman, Louis P.
Wadsworth and Cengage Learning, 2012
Buku Teks SO
Hackett, Steven C.
M.E. Sharpe, 2001
Buku Teks
Harrod, R.F.
Macmillan, 1956
Buku Teks