APA (7th ed.) Citation

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.].

Chicago Style (17th ed.) Citation

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.

MLA (9th ed.) Citation

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.