APA (7th ed.) Citation

Smithsonian Institution. (1920). Monograph of east American Scaphopod mollusks. GPO.

Chicago Style (17th ed.) Citation

Smithsonian Institution. Monograph of East American Scaphopod Mollusks. [Washington]: GPO, 1920.

MLA (9th ed.) Citation

Smithsonian Institution. Monograph of East American Scaphopod Mollusks. GPO, 1920.

Warning: These citations may not always be 100% accurate.