Civitello, Andrew M., author
McGraw-Hill, 2008
Buku Teks
Civitello, Andrew M., author
McGraw-Hill, 1994
Buku Teks
Bragg, Steven M., author
John Wiley & Sons, 2007
Buku Referensi
The World Bank Group
World Bank , 1974
Buku Teks
Elex Media Komputindo, 1994
Buku Teks