APA (7th ed.) Citation

Geological Society of America & Armentrout, J. M. (1981). Pacific Northwest cenozoic biostratigraphy. Geological Society of America.

Chicago Style (17th ed.) Citation

Geological Society of America and John M. Armentrout. Pacific Northwest Cenozoic Biostratigraphy. Boulder, Colo.: Geological Society of America, 1981.

MLA (9th ed.) Citation

Geological Society of America and John M. Armentrout. Pacific Northwest Cenozoic Biostratigraphy. Geological Society of America, 1981.