Lewis, C. Day
Jonathan Cape, 1949
Koleksi Publik
Brown, Richard H.
Cambridge University Press, 1977
Buku Teks SO
Curran, Stuart
Oxford University Press, 1986
Buku Teks SO
Wessels, Charlyn
Oxford University Press, 1991
Buku Teks SO
Duarte, Eduardo M.
Sense, 2012
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