CHalker, Sylvia
The Oxford dictionary of English grammar
Clarendon Press, 1994
 Buku Referensi
Wade, Terence
The Oxford Russian : grammar and verbs
New York : Oxford University Press, 2002
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Dreyer, Hilke
A practice grammar of German
Verlag fur Deutsch , 1994
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Hopkins, Diana
Cambridge grammar for ielts with answers: self-study grammar reference and practice
Cambridge University Press, 2011
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The oxford history of the prison: the practice of punishment in western Society
edited by Norval Morris and David J. Rothman
Oxford University Press, 1995
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