University of the Philippines in the Visayas, Department of Environment and Natural Resources, & United Nation Development Programme. (1993). Environmental planning and maintenace for sustainable development: Executive summary. University of the Philippines in the Visayas.
Παραπομπή σε μορφή Chicago (17η εκδ.)University of the Philippines in the Visayas, Department of Environment and Natural Resources, και United Nation Development Programme. Environmental Planning and Maintenace for Sustainable Development: Executive Summary. Miagao, Iloilo, Philippines: University of the Philippines in the Visayas, 1993.
Παραπομπή σε μορφή MLA (9th εκδ.)University of the Philippines in the Visayas, et al. Environmental Planning and Maintenace for Sustainable Development: Executive Summary. University of the Philippines in the Visayas, 1993.