(1979). [Rjumin, Valerij [sowjetruss. Kosmonaut]].
Chicago Style (17th ed.) Citation[Rjumin, Valerij [sowjetruss. Kosmonaut]]. 1979.
MLA (9th ed.) Citation[Rjumin, Valerij [sowjetruss. Kosmonaut]]. 1979.
Warning: These citations may not always be 100% accurate.