Cushman, Robert E., author
Appleton-Century-Crofts, 1963
Buku Teks
Barrett, Edward L., author
Foundation Press, 1977
Buku Teks
Kauper, Paul G., author
Little, Brown, 1966
Buku Teks
Cushman, Robert F., author
Appleton-Century-Crofs, 1955
Buku Teks
Fairman, Charles, author
Henry Holt and Company, 1948
Buku Teks