Barrett, Edward L.
Foundation Press, 1977
Buku Teks
Fairman, Charles
Henry Holt and Company, 1948
Buku Teks
Gunther, Gerald
Foundation Press, 1970
Buku Teks
Kauper, Paul G.
Little, Brown, 1971
Buku Teks
Cushman, Robert E.
Appleton-Century-Crofts, 1963
Buku Teks