Elkouri, Edna Asper
BNA Incorporated, 1960
Buku Teks
Elkouri, Frank, author
The bureau of nations affairs, 1997
Buku Teks
Hulgren, Thor
National Bureau of Economic Research; distributed by Columbia University Press, 1965
Buku Teks
Maurer, Herrymon, author
Macmillan, 1956
Buku Teks
Westing, John Howard, author
John Wiley & Sons, 1956
Buku Teks