Baron, Salo Wittmayer
Columbia University Press , 1958
Buku Teks SO
Mary Kupiec Cayton, Elliott J. Gorn, Peter W. Williams, editors
Charles Scribner's Sons, 1993
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Malhotra, Karamjit K.
Oxford University Press, 2016
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Herriot, Peter
Routledge, 2007
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