Environmental Center of the Philippines Foundation Incorporation & Department of Environment and Natural Resources. (1991). Manual for the preparation of an area ecological profile. [s.n.].
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Environmental Center of the Philippines Foundation Incorporation و Department of Environment and Natural Resources. Manual for the Preparation of an Area Ecological Profile. [s.l]: [s.n.], 1991.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Environmental Center of the Philippines Foundation Incorporation و Department of Environment and Natural Resources. Manual for the Preparation of an Area Ecological Profile. [s.n.], 1991.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.