APA Citation

Geological Society of America, & Geological Society of America. (1991). GSA Today. Boulder, Colo. U.S.A.: Geological Society of America.

Chicago Style Citation

Geological Society of America, and Geological Society of America. GSA Today. Boulder, Colo. U.S.A.: Geological Society of America, 1991.

MLA Citation

Geological Society of America, and Geological Society of America. GSA Today. Boulder, Colo. U.S.A.: Geological Society of America, 1991.

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