APA (7th ed.) Citation

Briggs, R. P., & Aquilar-Cortés, E. (1980). Geologic map of Fajardo and Cayo Icacos quadrangles, Puerto Rico. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Briggs, Reginald P., and Eduardo Aquilar-Cortés. Geologic Map of Fajardo and Cayo Icacos Quadrangles, Puerto Rico. Reston, Va.: U.S. Geological Survey, 1980.

MLA (9th ed.) Citation

Briggs, Reginald P., and Eduardo Aquilar-Cortés. Geologic Map of Fajardo and Cayo Icacos Quadrangles, Puerto Rico. U.S. Geological Survey, 1980.