De Guzman, S. A. (1997). Preserving the ancient rock art of Angono. Philippine Daily Inquirer.
芝加哥风格引文De Guzman, Susan A. "Preserving the Ancient Rock Art of Angono." Philippine Daily Inquirer 1997.
MLA引文De Guzman, Susan A. "Preserving the Ancient Rock Art of Angono." Philippine Daily Inquirer, 1997.
警告：这些引文格式不一定是100％准确.