Coffey, Peter, author
Macmillan, 1974
Buku Teks
Halm, George N., author
University of North-Carolina Press, 1945
Buku Teks
International Monetary Fund, 1999
Buku Teks
edited by Paul J. Zak
Edward Elgar Publishing, 1999
Buku Teks
International Monetary Fund , 1985
Buku Teks