APA (7th ed.) Citation

Harksen, J. C., & Green, M. (1971). Thin Elk Formation, Lower Pliocene, South Dakota. Science Center, University of South Dakota.

Chicago Style (17th ed.) Citation

Harksen, J. C., and Morton Green. Thin Elk Formation, Lower Pliocene, South Dakota. Vermillion: Science Center, University of South Dakota, 1971.

MLA (9th ed.) Citation

Harksen, J. C., and Morton Green. Thin Elk Formation, Lower Pliocene, South Dakota. Science Center, University of South Dakota, 1971.