David, W. P. (1990). Irrigation development in the Philippines: Brief history, present status, issues, problems and policy recommendations. Agricultural Mechanization Development Program, College of Engineering and Agro-industrial Technology, University of the Philippines at Los Banos.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিDavid, Wilfredo P. Irrigation Development in the Philippines: Brief History, Present Status, Issues, Problems and Policy Recommendations. College, Laguna: Agricultural Mechanization Development Program, College of Engineering and Agro-industrial Technology, University of the Philippines at Los Banos, 1990.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিDavid, Wilfredo P. Irrigation Development in the Philippines: Brief History, Present Status, Issues, Problems and Policy Recommendations. Agricultural Mechanization Development Program, College of Engineering and Agro-industrial Technology, University of the Philippines at Los Banos, 1990.