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शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMalayang, Ben S., et al. GATT-WTO and the Philippine Environment: Policy Safeguards to Ensure an Environment-friendly Competitiveness in World Trade. College, Laguna: ERMP, Institute of Environmental Science and Management, College of Arts and Sciences, University of the Philippines at Los Baños, 1996.
एमएलए (9वां संस्करण) प्रशस्ति पत्रMalayang, Ben S., et al. GATT-WTO and the Philippine Environment: Policy Safeguards to Ensure an Environment-friendly Competitiveness in World Trade. ERMP, Institute of Environmental Science and Management, College of Arts and Sciences, University of the Philippines at Los Baños, 1996.