Murry, John Middleton
Oxford University Press, 1956
Buku Teks
Epstein, E.L.
Methuen, 1978
Buku Teks
Thornborrow, Joanna
New York Routledge , 1998
Buku Teks
Love, Glen A.
Foresmann, 1969
Buku Teks
Nattrass, Laonora
Cambridge University Press, 2003
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