Bagchi, Biman, author
Cambridge University Press, 2013
Buku Teks
Washington The World Bank 1993,
Buku Teks
Wanielista, Martin P.
John Wiley & Sons, 1990
Buku Teks
Mays, Larry W., author
John Wiley & Sons, 2011
Buku Teks
N.Y. United Nations , 1980
Buku Teks