Coloma, S. Trash to treasure: Trilogy in joyful sustainability. Manila Bulletin..
Čikaški stil citiranja (17. izdanje)Coloma, Sonny. "Trash to Treasure: Trilogy in Joyful Sustainability." Manila Bulletin. .
MLA način citiranja (9. izdanje)Coloma, Sonny. "Trash to Treasure: Trilogy in Joyful Sustainability." Manila Bulletin., .
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