Philippines. Department of Education, Culture and Sports, & Philippines. Environmenment Management Bureau. (1999). Environmental education guide. DECS].
Čikaški stil citiranja (17. izdanje)Philippines. Department of Education, Culture and Sports, i Philippines. Environmenment Management Bureau. Environmental Education Guide. [Pasig City: DECS], 1999.
MLA način citiranja (9. izdanje)Philippines. Department of Education, Culture and Sports, i Philippines. Environmenment Management Bureau. Environmental Education Guide. DECS], 1999.
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