APA (7th ed.) Citation

Smithsonian Institution. (1915). Bibliographic index of American Ordovician and Silurian fossils: Volume 2. GPO.

Chicago Style (17th ed.) Citation

Smithsonian Institution. Bibliographic Index of American Ordovician and Silurian Fossils: Volume 2. [Washington]: GPO, 1915.

MLA (9th ed.) Citation

Smithsonian Institution. Bibliographic Index of American Ordovician and Silurian Fossils: Volume 2. GPO, 1915.

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