APA (7th ed.) Citation

Geological Survey (U.S.), Tollo, R. P., & Lowe, T. K. (1994). Geologic map of the Robertson River igneous suite, Blue Ridge province, northern and central Virginia. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.), Richard P. Tollo, and Tamara K. Lowe. Geologic Map of the Robertson River Igneous Suite, Blue Ridge Province, Northern and Central Virginia. Reston, VA: The Survey, 1994.

MLA (9th ed.) Citation

Geological Survey (U.S.), et al. Geologic Map of the Robertson River Igneous Suite, Blue Ridge Province, Northern and Central Virginia. The Survey, 1994.