APA (7th ed.) Citation

Billings Geological Society. Field Conference & Billings Geological Society. (1950). First annual field conference: September 15-17, 1950. [The Society].

Chicago Style (17th ed.) Citation

Billings Geological Society. Field Conference and Billings Geological Society. First Annual Field Conference: September 15-17, 1950. [Billings, Mont.]: [The Society], 1950.

MLA (9th ed.) Citation

Billings Geological Society. Field Conference and Billings Geological Society. First Annual Field Conference: September 15-17, 1950. [The Society], 1950.