APA (7th ed.) Citation

Hoagberg, R. K., & Bayer, T. N. (1967). Guide to the caves of Minnesota. University of Minnesota, Minnesota Geological Survey.

Chicago Style (17th ed.) Citation

Hoagberg, Rudolph K., and T. N. Bayer. Guide to the Caves of Minnesota. Minneapolis: University of Minnesota, Minnesota Geological Survey, 1967.

MLA (9th ed.) Citation

Hoagberg, Rudolph K., and T. N. Bayer. Guide to the Caves of Minnesota. University of Minnesota, Minnesota Geological Survey, 1967.