* النقاط القصوى في أوكرانيا* General Depiction of the Empty Plains (in Common Parlance, the Ukraine) Together with its Neighboring Provinces by Guillaume Le Vasseur de Beauplan, 1648* Zastavnyi, F. D. "Physical geography of Ukraine: lowlands and uplands of Ukraine".
==External links==* General Depiction of the Empty Plains (in Common Parlance, the Ukraine) Together with its Neighboring Provinces by Guillaume Le Vasseur de Beauplan, 1648* Zastavnyi, F. D. "Physical geography of Ukraine: lowlands and uplands of Ukraine".