Books of the world // Google, 5 август 2010. Посетен на 15 август 2010. After we exclude serials, we can finally count all the books in the world. There are 129,864,880 of them. At least until Sunday
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Edmund Burke. Islam at the Center: Technological Complexes and the Roots of Modernity // Journal of World History 20 (2). University of Hawaii Press, June 2009. DOI:10.1353/jwh.0.0045. с. 165 – 186 [43].