APA (7th ed.) Citation

Schlegel, D. M. (1957). Gem stones of the United States. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Schlegel, Dorothy McKenney. Gem Stones of the United States. [Washington, D.C.]: United States Department of the Interior, Geological Survey, 1957.

MLA (9th ed.) Citation

Schlegel, Dorothy McKenney. Gem Stones of the United States. United States Department of the Interior, Geological Survey, 1957.

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