International Bank for Reconstruction and Development.
World Bank, 2006
Buku Teks
edited by Hillol Kargupta
CRC Press, Taylor & Francis Group, 2009
Buku Teks SO
Jordan, James A.
John Wiley & Sons, 2000
Buku Teks
López, Ana Belen Cristobal
Springer, 2012
eBooks
Harrington, H. James
McGraw-Hill, 1995
Buku Teks