Macintyre, Stuart
Oxford University Press, 1986
Buku Teks SO
Bolton, Geoffrey
Oxford University Press, 1990
Buku Teks SO
Peter Pierce, Rosemary Hunter, editor
Oxford Univeristy Press, 1987
Buku Referensi
editor, John Prest
Oxford University Press, 1993
Buku Referensi
Oxford University Press, 1981
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