Poole, Austin Lane
Oxford University Press , 1993
Buku Teks
Pallister, Anne, author
Oxford University Press, 1972
Buku Teks
Coulton, G.G. (George Gordon), author
Macmillan; University Press, 1938
Buku Teks
Richmond, I.A., author
Penguin Books, 1955
Buku Teks
Welch, W., author
Macmillan, 1908
Buku Teks