Perone, Sam P.
McGraw-Hill, 1973
Buku Teks
edited by Peter Lykos
John Wiley, 1981
Buku Teks
Barker, Philip G., author
Pergamon Press, 1985
Buku Teks
Jones, William O.
Stanford University Press, 1959
Buku Teks
Garside, R.G., author
Clarendon Press, 1980
Buku Teks