Philippines. Department of Environment and Natural Resources & Integrated Environmental Management for Sustainable Development Programme. (1997). Guidebooks on sustainable land use planning and management. Department of Environment and Natural Resources.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Philippines. Department of Environment and Natural Resources و Integrated Environmental Management for Sustainable Development Programme. Guidebooks on Sustainable Land Use Planning and Management. Quezon City: Department of Environment and Natural Resources, 1997.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Philippines. Department of Environment and Natural Resources و Integrated Environmental Management for Sustainable Development Programme. Guidebooks on Sustainable Land Use Planning and Management. Department of Environment and Natural Resources, 1997.