Bicol River Basin Development Program. (1976). Comprehensive development plan: 1975-2000. The Office.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBicol River Basin Development Program. Comprehensive Development Plan: 1975-2000. Baras, Canaman, Camarines Sur: The Office, 1976.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBicol River Basin Development Program. Comprehensive Development Plan: 1975-2000. The Office, 1976.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.