Bicol River Basin Development Program. (1976). Comprehensive development plan: 1975-2000. The Office.
Dyfyniad Arddull ChicagoBicol River Basin Development Program. Comprehensive Development Plan: 1975-2000. Baras, Canaman, Camarines Sur: The Office, 1976.
Dyfyniad MLABicol River Basin Development Program. Comprehensive Development Plan: 1975-2000. The Office, 1976.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.