Villanueva, T. R. (2005). Upland ecosystem management (2nd ed.). UP Open University.
芝加哥风格引文Villanueva, Teodoro R. Upland Ecosystem Management. 2nd ed. Diliman, Quezon City: UP Open University, 2005.
MLA引文Villanueva, Teodoro R. Upland Ecosystem Management. 2nd ed. UP Open University, 2005.
警告：这些引文格式不一定是100％准确.