Crawford, R.M.
Hutchinson University Library, 1952.
Buku Teks
Berney, Maurice
Angus and Robertson, 1965
Buku Teks
Spate, Oskar Hermann Kristian
Ernest Benn, 1968
Buku Teks
Princeton University Press, 1944
Buku Teks
Atkins, Ruth
John Wiley & Sons, 1980
Buku Teks