APA (7th ed.) Citation

Smith, J. P. (1932). Lower Triassic ammonoids of North America. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Smith, James Perrin. Lower Triassic Ammonoids of North America. Washington: United States Department of the Interior, Geological Survey, 1932.

MLA (9th ed.) Citation

Smith, James Perrin. Lower Triassic Ammonoids of North America. United States Department of the Interior, Geological Survey, 1932.