Invasão mongol da Rússia (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Invasão mongol da Rússia" in Portuguese language version.

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Michell, Robert; Forbes, Nevell (1914). «The Chronicle of Novgorod 1016-1471». Michell. London, Offices of the society. p. 64. Consultado em 4 de junho de 2014

(the University of Michigan)John Merton Patrick (1961). Artillery and warfare during the thirteenth and fourteenth centuries. Volume 8, Issue 3 of Monograph series. [S.l.]: Utah State University Press. p. 12. Consultado em 28 de novembro de 2011. The Mongols invaded the Russian steppes at this time, reaching the Crimea before turning back at the Khan's orders. The youngest son of Genghis, Tului, was given the special task of destroying walled cities during this campaign, employing the Chinese engines