edited by Susan Bambrick
Cambridge University Press, 1994
Buku Referensi
Crawford, R.M.
Hutchinson's University Library, 1955
Buku Teks
Crawford, R.M.
Hutchinson University Library, 1952.
Buku Teks
Princeton University Press, 1944
Buku Teks
Atkins, Ruth
John Wiley & Sons, 1980
Buku Teks