Pag-iwayan, J. Building eco-friendly, sustainable play areas. Manila Bulletin.
芝加哥风格引文Pag-iwayan, Jessica. "Building Eco-friendly, Sustainable Play Areas." Manila Bulletin .
MLA引文Pag-iwayan, Jessica. "Building Eco-friendly, Sustainable Play Areas." Manila Bulletin, .
警告：这些引文格式不一定是100％准确.