Purnell, L. R. (1968). Catalog of the type specimens of invertebrate fossils. Smithsonian Institution Press; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.].
Lua i Stíl Chicago (17ú heag.)Purnell, Louis R. Catalog of the Type Specimens of Invertebrate Fossils. Washington: Smithsonian Institution Press; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1968.
Lua MLA (9ú heag.)Purnell, Louis R. Catalog of the Type Specimens of Invertebrate Fossils. Smithsonian Institution Press; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.