Boleslau III da Boêmia (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Boleslau III da Boêmia" in Portuguese language version.

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BOWLEY, Mary (1848). Universal History on Scriptural Principles, Chiefly Designed for the Young: The Middle Ages: from the death of Charlemagne to the death of Richard I, A.D.814-A.D.1199 (em inglês). Londres: Samuel Bagster and Sons. p. 196