APA (7th ed.) Citation

Geological Society of America. (1991). GSA today: A publication of the Geological Society of America. Geological Society of America.

Chicago Style (17th ed.) Citation

Geological Society of America. GSA Today: A Publication of the Geological Society of America. Boulder, Colo.: Geological Society of America, 1991.

MLA (9th ed.) Citation

Geological Society of America. GSA Today: A Publication of the Geological Society of America. Geological Society of America, 1991.