Contreras, A. P. (2004). Realities of a watershed management approach in the Philippines: A framework for case analysis. Philippine Institute for Development Studies.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিContreras, Antonio P. Realities of a Watershed Management Approach in the Philippines: A Framework for Case Analysis. Makati City: Philippine Institute for Development Studies, 2004.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিContreras, Antonio P. Realities of a Watershed Management Approach in the Philippines: A Framework for Case Analysis. Philippine Institute for Development Studies, 2004.
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