Selden, Raman, author
The University Press of Kentucky , 1993
Buku Teks
Newbury House Publishers, 1981
Buku Teks
Adams, John, 1938-, author
St. Martin's Press, 1985
Buku Teks
Brown, David, author
Airlife Publishing LTD, 1995
Buku Teks
Faucett, L.W., author
Oxford University Press, 1949
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