Koo, C. G. (2007). The importance of being useless. Philippine Daily Inquirer.
芝加哥风格引文Koo, Crystal Gail. "The Importance of Being Useless." Philippine Daily Inquirer 2007.
MLA引文Koo, Crystal Gail. "The Importance of Being Useless." Philippine Daily Inquirer, 2007.
警告：这些引文格式不一定是100％准确.