Tartakovskij, B. G. (1986). Fridrich Engel's pod okom prusskoj tajnoj policii . (Po neopublikovannym materialam CPA IML pr CK KPSS).
Chicago Style (17th ed.) CitationTartakovskij, Boris Grigor'evič. Fridrich Engel's Pod Okom Prusskoj Tajnoj Policii . (Po Neopublikovannym Materialam CPA IML Pr CK KPSS). 1986.
MLA (8th ed.) CitationTartakovskij, Boris Grigor'evič. Fridrich Engel's Pod Okom Prusskoj Tajnoj Policii . (Po Neopublikovannym Materialam CPA IML Pr CK KPSS). 1986.
Warning: These citations may not always be 100% accurate.