APA

Rodríguez-Martínez J., Scharlach R. A. & Torres González A. (1991). Geologic and hydrologic data collected at test holes NC-1 and NC-3, Guaynabo and San Juan, eastern Puerto Rico. San Juan, P.R: Geological Survey.

Chicago

Rodríguez-Martínez Jesús, Scharlach Richard A and Torres González Arturo. 1991. Geologic and hydrologic data collected at test holes NC-1 and NC-3, Guaynabo and San Juan, eastern Puerto Rico. San Juan, P.R: Geological Survey.

Harvard

Rodríguez-Martínez J., Scharlach R. A. and Torres González A. (1991). Geologic and hydrologic data collected at test holes NC-1 and NC-3, Guaynabo and San Juan, eastern Puerto Rico. San Juan, P.R: Geological Survey.

MLA

Rodríguez-Martínez Jesús, Scharlach Richard A and Torres González Arturo. Geologic and hydrologic data collected at test holes NC-1 and NC-3, Guaynabo and San Juan, eastern Puerto Rico. San Juan, P.R: Geological Survey. 1991.