Ahmad Zaki, author
2008
UI - Skripsi (Open)
Kalbermatten, John M.
The World Bank, 1980
Buku Teks
edited by Richard Feachem, Michael McGarry, Duncan Mara
John Wiley & Sons, 1980
Buku Teks
Hammer, Mark J., author
Prentice-Hall, 2004
Buku Teks
Rishel, James B., author
Mcgraw-Hill, 2002
Buku Referensi