APA (7th ed.) Citation

Montana Oil and Gas Fields Symposium Billings, Mont, Montana Geological Society, & Tonnsen, J. J. (1985). Montana Oil and Gas Fields Symposium, 1985. Montana Geological Society.

Chicago Style (17th ed.) Citation

Montana Oil and Gas Fields Symposium Billings, Mont, Montana Geological Society, and John J. Tonnsen. Montana Oil and Gas Fields Symposium, 1985. Billings: Montana Geological Society, 1985.

MLA (9th ed.) Citation

Montana Oil and Gas Fields Symposium Billings, Mont, et al. Montana Oil and Gas Fields Symposium, 1985. Montana Geological Society, 1985.