Federal reserve bank of New York, 1990
Buku Teks
Adams, E. Sherman, author
Ronald Press, 1950
Buku Teks
Prager, Jonas
Random House , 1971
Buku Teks
Melton, William C., author
Dow Jones-Irwin, 1985
Buku Teks
Horvitz, Paul M.
Prentice-Hall, 1963
Buku Teks