Greenlaw, Paul S.
Harper & Row, 1986
Buku Teks
Claessens, Stijn
D.C. The World Bank , 1993
Buku Teks
Gray, Clifford F.
Irwin-McGraw-Hill, 2000
Buku Teks
Beehler, Paul J.
John Wiley & Sons, 1983
Buku Teks
Nelson, A. Tom
California Goodyear Pub., 1981
Buku Teks