Smithsonian Tropical Research Institute. Center for Tropical Forest Science & Co, L. L. (2006). Forest trees of Palanan, Philippines: A study in population ecology. Center for Integrative and Development Studies, University of the Philippines.
Chicago-referens (17:e uppl.)Smithsonian Tropical Research Institute. Center for Tropical Forest Science och Leonard L. Co. Forest Trees of Palanan, Philippines: A Study in Population Ecology. Diliman: Center for Integrative and Development Studies, University of the Philippines, 2006.
MLA-referens (9:e uppl.)Smithsonian Tropical Research Institute. Center for Tropical Forest Science och Leonard L. Co. Forest Trees of Palanan, Philippines: A Study in Population Ecology. Center for Integrative and Development Studies, University of the Philippines, 2006.