APA (7th ed.) Citation

Ojakangas, R. W., Sims, P. K., & Hooper, P. R. (1978). Geologic map of the Tower quadrangle, St. Louis County, Minnesota. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Ojakangas, Richard W., P. K. Sims, and Peter R. Hooper. Geologic Map of the Tower Quadrangle, St. Louis County, Minnesota. Reston, Va.: U.S. Geological Survey, 1978.

MLA (9th ed.) Citation

Ojakangas, Richard W., et al. Geologic Map of the Tower Quadrangle, St. Louis County, Minnesota. U.S. Geological Survey, 1978.