George Orwell, Review of Penguin Books, New English Weekly, 5 March 1936, http://vintagepenguins.blogspot.co.uk/p/review-ofpenguin-books.html
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Karl Marx (1863/1995). Capital, edited by David McLellan, OxFord: OxFord University Press, P. 291–2.
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Отчет и приложения к нему: Boston Consulting Group (1975) Strategy Alternatives for the British Motorcycle Industry, London: Her Majesty’s Stationery Office.