(1992). Forestry for people and nature: Field research and theory on environment and development in the Cagayan Valley, Philippines. Cagayan Valley Programme on Environment and Development, Isabela State University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Forestry for People and Nature: Field Research and Theory on Environment and Development in the Cagayan Valley, Philippines. Cabagan, Isabela: Cagayan Valley Programme on Environment and Development, Isabela State University, 1992.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Forestry for People and Nature: Field Research and Theory on Environment and Development in the Cagayan Valley, Philippines. Cagayan Valley Programme on Environment and Development, Isabela State University, 1992.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.