Feavearyear, Albert
Oxford Clarendon Press , 1963
Buku Teks
Lovell, Colin Rhys
Oxford University Press, 1962
Buku Teks
Winfield, Percy Henry
Univercity Press, 1921
Buku Teks
Pollard, Arthur, author
Longman, 1963
Buku Teks
Cambridge University Press, 2010
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