Woodward, Bob, author
Pocket Books, 2000
Buku Teks
Barger, Harold, author
Rand McNally, 1964
Buku Teks
Meek, Paul
NY (33 Liberty St., New York 10045) : Federal Reserve Bank of New York, 1982
Buku Teks
Krooss, Herman Edward, 1912-1975, author
Prentice-Hall, 1955
Buku Teks
edited by Harold F. Williamson
Prentice-Hall, 1951
Buku Teks