Kotkin 2017, стр. 702 — „Nikolai Kuznetsov, the Serbian immigrants' son who had joined the party at age nineteen in 1924.” Kotkin, Stephen (2017). Stalin: Waiting for Hitler 1929-1941 [Стаљин: Чекајући Хитлера, 1929-1941]. New York: Penguin Press. ISBN9780735224483.
