World Bank , 1991
Buku Teks
edited by American Writing Corporation
The World Bank , 1996
Buku Teks
edited by Frank E. Bair
Gale Research Inc., 1991
Buku Referensi
edited by William R. Cline and Sidney Weintraub
Washington, D.C. , Brooklins Institution
Buku Teks
edited by Jacob A. Frenkel and Michael L. Mussa
Auburn House, 1984
Buku Teks