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Lev Vygotsky Lev Valeryanovich Leshchenko Lev Nikolayevich Tolstoy Lev Davidovich Trotsky Lev Ivanovich Yashin Lev Zakharovich Mekhlis Lev Davidovich Landau Lev Mikhailovich Dovator Lev Borisovich Kamenev Lev SchnirelmannTài liệu tham khảo
WikiPedia: Lev_Vygotsky http://individual.utoronto.ca/yasnitsky/texts/Yasn... http://individual.utoronto.ca/yasnitsky/texts/Yasn... http://individual.utoronto.ca/yasnitsky/texts/Yasn... http://ahp.yorku.ca/?p=387 http://www.amazon.com/dp/0521537878 http://www.routledge.com/books/details/97811388873... http://www.scribd.com/doc/71468002/Yasnitsky-2011-... http://www.scribd.com/doc/79482780/Yasnitsky-2011-... http://www.springerlink.com/content/278j5025767m22... http://www.springerlink.com/content/278j5025767m22...