Philippines. Department of Environment and Natural Resources. (2001). PDS field guide: Project documentation system for ENR planning & management. National Support Program on Environment and Natural Resources Planning and Management (NSP-ENRPM/NSP).
Citazione stile Chigago Style (17a edizione)Philippines. Department of Environment and Natural Resources. PDS Field Guide: Project Documentation System for ENR Planning & Management. Quezon City: National Support Program on Environment and Natural Resources Planning and Management (NSP-ENRPM/NSP), 2001.
Citatione MLA (9a ed.)Philippines. Department of Environment and Natural Resources. PDS Field Guide: Project Documentation System for ENR Planning & Management. National Support Program on Environment and Natural Resources Planning and Management (NSP-ENRPM/NSP), 2001.