Cagayan Valley Programme on Environment & 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 & Development, Isabela State University.
Chicago-viite (17. p.)Cagayan Valley Programme on Environment & 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 & Development, Isabela State University, 1992.
MLA-viite (9. p.)Cagayan Valley Programme on Environment & Development. Forestry for People and Nature: Field Research and Theory on Environment and Development in the Cagayan Valley, Philippines. Cagayan Valley Programme on Environment & Development, Isabela State University, 1992.