Calasagsag, S. (1997). How sustainable is countryside reforestation? Manila Chronicle.
芝加哥风格引文Calasagsag, Susan. "How Sustainable Is Countryside Reforestation?" Manila Chronicle 1997.
MLA引文Calasagsag, Susan. "How Sustainable Is Countryside Reforestation?" Manila Chronicle, 1997.
警告：这些引文格式不一定是100％准确.