Gekker, R. F. (1940). Nižnesilurijskie i devonskie iglokožie: Paleoėkologija nižnego karbona = Ordovician and devonian echinoderms : on lower carboniferous palecology. Akad.
Chicago Style (17th ed.) CitationGekker, Roman F. Nižnesilurijskie I Devonskie Iglokožie: Paleoėkologija Nižnego Karbona = Ordovician and Devonian Echinoderms : On Lower Carboniferous Palecology. Moskva [u.a.]: Akad, 1940.
MLA (9th ed.) CitationGekker, Roman F. Nižnesilurijskie I Devonskie Iglokožie: Paleoėkologija Nižnego Karbona = Ordovician and Devonian Echinoderms : On Lower Carboniferous Palecology. Akad, 1940.
Warning: These citations may not always be 100% accurate.