APA (7th ed.) Citation

Wahlstrom, E. E., Hornback, V. Q., & Robinson, C. S. (1981). Geology of the western part of the Harold D. Roberts Tunnel, Colorado (Stations 0+00 to 690+00). United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Wahlstrom, Ernest E., V. Quentin Hornback, and Charles Sherwood Robinson. Geology of the Western Part of the Harold D. Roberts Tunnel, Colorado (Stations 0+00 to 690+00). Washington: United States Department of the Interior, Geological Survey, 1981.

MLA (9th ed.) Citation

Wahlstrom, Ernest E., et al. Geology of the Western Part of the Harold D. Roberts Tunnel, Colorado (Stations 0+00 to 690+00). United States Department of the Interior, Geological Survey, 1981.