APA (7th ed.) Citation

Wahlman, G. P. (1992). Middle and Upper Ordovician symmetrical univalved mollusks (Monoplacophora and Bellerophontina) of the Cincinnati arch region. U.S. Department of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Wahlman, G. P. Middle and Upper Ordovician Symmetrical Univalved Mollusks (Monoplacophora and Bellerophontina) of the Cincinnati Arch Region. Washington: U.S. Department of the Interior, U.S. Geological Survey, 1992.

MLA (9th ed.) Citation

Wahlman, G. P. Middle and Upper Ordovician Symmetrical Univalved Mollusks (Monoplacophora and Bellerophontina) of the Cincinnati Arch Region. U.S. Department of the Interior, U.S. Geological Survey, 1992.