Philippines. Department of Education, Culture and Sports, & Philippines. Environmenment Management Bureau. (1999). Environmental education guide. DECS].
Citazione stile Chigago Style (17a edizione)Philippines. Department of Education, Culture and Sports, e Philippines. Environmenment Management Bureau. Environmental Education Guide. [Pasig City: DECS], 1999.
Citatione MLA (9a ed.)Philippines. Department of Education, Culture and Sports, e Philippines. Environmenment Management Bureau. Environmental Education Guide. DECS], 1999.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.