APA (7th ed.) Citation

Krushensky, R. D., & Monroe, W. H. (1978). Geologic map of the Peñuelas and Punta Cuchara quadrangles, Puerto Rico. The Survey.

Chicago Style (17th ed.) Citation

Krushensky, R. D., and Watson Hiner Monroe. Geologic Map of the Peñuelas and Punta Cuchara Quadrangles, Puerto Rico. Reston, Va.: The Survey, 1978.

MLA (9th ed.) Citation

Krushensky, R. D., and Watson Hiner Monroe. Geologic Map of the Peñuelas and Punta Cuchara Quadrangles, Puerto Rico. The Survey, 1978.