APA

United States, McClymonds N. E. & Junta de Calidad Ambiental de Puerto Rico. (1972). Water resources of the Ponce area, Puerto Rico. Commonwealth of Puerto Rico: United States Geological Survey.

Chicago

United States, McClymonds Neal E and Junta de Calidad Ambiental de Puerto Rico. 1972. Water resources of the Ponce area, Puerto Rico. Commonwealth of Puerto Rico: United States Geological Survey.

Harvard

United States, McClymonds N. E. and Junta de Calidad Ambiental de Puerto Rico. (1972). Water resources of the Ponce area, Puerto Rico. Commonwealth of Puerto Rico: United States Geological Survey.

MLA

United States, McClymonds Neal E and Junta de Calidad Ambiental de Puerto Rico. Water resources of the Ponce area, Puerto Rico. Commonwealth of Puerto Rico: United States Geological Survey. 1972.