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WikiPedia: Nạn_đói_Nga_1921 //pubmed.ncbi.nlm.nih.gov/7953492 http://www.volgagermans.net/volgagermans/Volga%20F... //doi.org/10.1111%2Fj.1467-7717.1994.tb00309.x http://www.hoover.org/publications/digest/6731711.... http://www.marxists.org/archive/trotsky/works/1930... http://www.pbs.org/wgbh/americanexperience/films/f... http://dhktna.edu.vn/tai-nguyen-hoc-tap/chinh-sach... https://books.google.com/?id=H1jsgYCoRioC https://books.google.com/books?id=ChRk43tVxTwC&pg=... https://www.nytimes.com/1921/10/01/archives/league...