Smith, Glenn C., author
John Wiley & Sons, 2012
Buku Teks
Cooley, Thomas M.
Little, Brown and Company, 1898
Buku Teks
Fairman, Charles, author
Henry Holt and Company, 1948
Buku Teks
Wright, Benjamin F., author
Phoenik Books, 1967
Buku Teks
by William B. Lockhart ... [and others]
West Publishing Company, 1975
Buku Teks