Schwyzer, Philip, author
Cambridge University Press, 2009
eBooks
Coulton, G.G. (George Gordon), author
Macmillan; University Press, 1938
Buku Teks
Gillespie, Stuart, author
Wiley, 2011
Buku Teks
Ilbert, Courtenay
Oxford University Press , 1947
Buku Teks
Williamson, James A., author
Macmilan and Co,, 1950
Buku Teks