Galupo, R. P. (2007). Imagine the world without plastic. Philippine Starweek.
芝加哥风格引文Galupo, Rey P. "Imagine the World Without Plastic." Philippine Starweek 2007.
MLA引文Galupo, Rey P. "Imagine the World Without Plastic." Philippine Starweek, 2007.
警告：这些引文格式不一定是100％准确.