Cambridge University Press , 2012
Buku Teks
edited by Beth A. Simmons and Richard H. Steinberg
Cambridge University Press, 2006
Buku Teks
by Maxwell Watson [and others]
International Monetary Fund, 1986
Buku Teks
Fenwick, Charles G.
Appleton-Century-Crofts, 1948
Buku Teks
Shaw, Malcolm Nathan, 1947-
Cambridge, 2003
Buku Teks