APA (7th ed.) Citation

Krushensky, R. D. (1972). Geology of the Istarú quadrangle, Costa Rica. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Krushensky, R. D. Geology of the Istarú Quadrangle, Costa Rica. [Washington, D.C.]: United States Department of the Interior, Geological Survey, 1972.

MLA (8th ed.) Citation

Krushensky, R. D. Geology of the Istarú Quadrangle, Costa Rica. United States Department of the Interior, Geological Survey, 1972.