Philippines. Protected Areas and Wildlife Bureau. (1992). Field reference material on protected area. Foundation for Sustainable Development (FSDI) Department of Environment and Natural Resources (DENR).
Chicago-referens (17:e uppl.)Philippines. Protected Areas and Wildlife Bureau. Field Reference Material on Protected Area. [Quezon City]: Foundation for Sustainable Development (FSDI) Department of Environment and Natural Resources (DENR), 1992.
MLA-referens (9:e uppl.)Philippines. Protected Areas and Wildlife Bureau. Field Reference Material on Protected Area. Foundation for Sustainable Development (FSDI) Department of Environment and Natural Resources (DENR), 1992.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.