Não informado. (1969). Smithsonian contributions to paleobiology. Smithsonian Institution.
Lua i Stíl Chicago (17ú heag.)Não informado. Smithsonian Contributions to Paleobiology. Washington: Smithsonian Institution, 1969.
Lua MLA (8ú heag.)Não informado. Smithsonian Contributions to Paleobiology. Smithsonian Institution, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.