APA (7th ed.) Citation

Smithsonian Institution. Office of the Secretary. (1860). Circular to entomologists. publisher not identified].

Chicago Style (17th ed.) Citation

Smithsonian Institution. Office of the Secretary. Circular to Entomologists. [S.l.: publisher not identified], 1860.

MLA (9th ed.) Citation

Smithsonian Institution. Office of the Secretary. Circular to Entomologists. publisher not identified], 1860.

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