Anglin, W.S.
Springer-Verlag, 1994
Buku Teks
Plucknett, Theodore F. T.
Little, Brown and Company, 1956
Buku Teks
Hooker, M. B., author
Clarendon Press, 1978
Buku Teks
Roth, Leland M
Harper & Row Publishers, 1979
Buku Teks
Busch, Moel F.
American Heritage Pub. Co., 1972
Buku Teks