Mason, Alpheus Thomas,1899-1989, author
Prentice-Hall, 1959
Buku Teks
Mason, Alpheus Thomas,1899-1989, author
Cornel University Press, 1955
Buku Teks
Leopold, Richard W., author
Alfred A. Knopf, 1962
Buku Teks
Hurst, James Willard, author
Little, Brown, 1950
Buku Teks
McIlwain, Charles Howard, author
Macmillan, 1957
Buku Teks