APA (7th ed.) Citation

Smithsonian Institution. (1923). Opalind ciliate infusorians. GPO.

Chicago Style (17th ed.) Citation

Smithsonian Institution. Opalind Ciliate Infusorians. [Washington]: GPO, 1923.

MLA (9th ed.) Citation

Smithsonian Institution. Opalind Ciliate Infusorians. GPO, 1923.

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