Philippines. Region 11. National Economic and Development Authority. Regional Development Council. (1999). Cagayan Valley (Region II): Regional strategic development plan 1999-2004 : directions for the 21st century. Regional Development Council, NEDA.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPhilippines. Region 11. National Economic and Development Authority. Regional Development Council. Cagayan Valley (Region II): Regional Strategic Development Plan 1999-2004 : Directions for the 21st Century. Tuguegarao City: Regional Development Council, NEDA, 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPhilippines. Region 11. National Economic and Development Authority. Regional Development Council. Cagayan Valley (Region II): Regional Strategic Development Plan 1999-2004 : Directions for the 21st Century. Regional Development Council, NEDA, 1999.