Newmark, Maxim, author
New York : Philosophical Library, 1950
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Jones, Randall L., author
New York : Routledge , 2006
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Guinagh, Kevin, author
New York, The H.W. Wilson, 1965
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Soothill, W.E. (William Edward), author
Motilal Banarsidass Publishers Private Limites, 1937
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Bliss, Alan J., author
Routledge & Kegan Paul, 1966
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