Ramsay, J.A.
Cambridge University Press, 1977
Buku Teks
edited by D.C. Smith and Y. Tiffon
Pergamon Press, 1980
Buku Teks
Williams & WIlkims , 1990
Buku Teks
Cambridge University Press, 1982
Buku Teks
Bentley, P.J.
Cambridge University Press, 1982
Buku Teks