found: His Proletariatning bui︠u︡k doḣiĭsi, 1971.
found: Alisher Navoiĭ asarlariga ishlangan rasmlar XV-XIX asrlar, 1982:t.p. (Ė. I︠U︡. I︠U︡supov; E. Yu. Yusupov)
found: Akhunova, M.A. Rabochiĭ klass Uzbekistana v uslovii︠a︡kh ... 1984:t.p. (akademik AN UzSSR E.I︠U︡. I︠U︡supov)
found: Salikov, R. Nat︠s︡ionalʹnye prot︠s︡essy v SSSR, 1987:t.p. (Ė. I︠U︡. I︠U︡supov) colophon (Ėrkin I︠U︡supovich I︠U︡supov)
found: His Perekhod k sot︠s︡ializmu, minui︠a︡ kapitalizm, 1987:t.p. (Ė. I︠U︡. I︠U︡supov) verso t.p. (Ėrkin I︠U︡supovich I︠U︡supov)
found: Tashkent, 1984:p. 410 (I︠U︡supov, Ėrkin, b. 1929)
found: O'trar, 2007:t.p. verso (Erkin Yusupov)
found: Google, December 9, 2013http://megabook.ru/article/%D0%AE%D0%A1%D0%A3%D0%9F%D0%9E%D0%92%20%D0%AD%D1%80%D0%BA%D0%B8%D0%BD%20%D0%AE%D1%81%D1%83%D0%BF%D0%BE%D0%B2%D0%B8%D1%87 (I︠U︡supov, Erkin I︠U︡sopovich; born March 15, 1929; died August 5, 2003)
