APA (7th ed.) Citation

Seiders, V. M., & Pease, M. H., Jr. (1971). Geologic map of the El Yunque quadrangle, Puerto Rico. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Seiders, Victor M., and Maurice H. Pease, Jr. Geologic Map of the El Yunque Quadrangle, Puerto Rico. Washington, D.C.: U.S. Geological Survey, 1971.

MLA (9th ed.) Citation

Seiders, Victor M., and Maurice H. Pease, Jr. Geologic Map of the El Yunque Quadrangle, Puerto Rico. U.S. Geological Survey, 1971.