-. Cultural Progress in The U.S.S.R: Statistical Returns. Foreign Languages Publishing House.
Chicago Style aipamena-. Cultural Progress in The U.S.S.R: Statistical Returns. Foreign Languages Publishing House.
MLA aipamena-. Cultural Progress in The U.S.S.R: Statistical Returns. Foreign Languages Publishing House.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.