Tolong jelaskan mengenai Catatan dari Sergo Ordzhonikidze

Sheila Fitzpatrick, "Ordzhonikidze's Takeover of Vesenkha: A Case Study in Soviet Bureaucratic Politics," Soviet Studies, vol. 37, no. 2 (April 1985), pp. 153–172. In JSTOR

Vladimir L. Bobrov "The Mystery of Ordzhonikidze’s Death"

Dziga Vertov 1937 film "Памяти Серго Орджоникидзе (In Memory of Sergo Ordzhonikidze)"