APA (7th ed.) Citation

Smithsonian Institution. (1926). Fossil footprints from Grand Canyon. [publisher not identified].

Chicago Style (17th ed.) Citation

Smithsonian Institution. Fossil Footprints from Grand Canyon. [Washington]: [publisher not identified], 1926.

MLA (9th ed.) Citation

Smithsonian Institution. Fossil Footprints from Grand Canyon. [publisher not identified], 1926.

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