THEORY AND PRACTICE OF HISTORICAL SOURCE STUDIES. Book review of: Georgieva N.G. Historical Source Studies: Theoretical Problems: Textbook for High School (Moscow: Prospekt, 2016. 248 p.); Georgieva N.G. Historical Source Studies: Terminological and Methodical Problems:Textbook for Humanities Departments of High School (Moscow: Prospekt, 2016. 192 p.) - PDF (Russian)