Isabela State University. Cagayan Valley Programme on Environment and Development. (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)Isabela State University. Cagayan Valley Programme on Environment and Development. 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)Isabela State University. Cagayan Valley Programme on Environment and Development. 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.