Исторический источник в свете «теории отражения», или еще раз о том, «отражается» ли действительность в исторических источниках
The problems of the man are examined in the context of the state development, human inner world, and perception of historical events. The researcher has used their private sources such as diaries, memoirs and letters which reflect the levels of spiritual life and psychology of people living in individual historic ages.
A research of the Russian version of neukantianism as special conception, the , principle of studing the Different formulated by A.I. Vvedensky, application of this conception by I.I. Lapshin and A.S. Lappo-Danilevsky for the methodology of history.