Peter Pierce, Rosemary Hunter, editor
Oxford Univeristy Press, 1987
Buku Referensi
general editor: Laurie Hergenhan ; editors : Bruce Bennett ... [et al.]
Penguin Books, 1988
Buku Teks
Crawford, R.M.
Hutchinson's University Library, 1955
Buku Teks
Crawford, R.M.
Hutchinson University Library, 1952.
Buku Teks
Berney, Maurice
Angus and Robertson, 1965
Buku Teks