(1990). A comprehensive history of irrigation in the Philippines. National Irrigation Administration.
Cita Chicago (17th ed.)A Comprehensive History of Irrigation in the Philippines. Quezon City: National Irrigation Administration, 1990.
Cita MLA (9th ed.)A Comprehensive History of Irrigation in the Philippines. National Irrigation Administration, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.