De Guzman, S. A. (1997). Preserving the ancient rock art of Angono. Philippine Daily Inquirer.
Cita Chicago (17th ed.)De Guzman, Susan A. "Preserving the Ancient Rock Art of Angono." Philippine Daily Inquirer 1997.
Cita MLA (9th ed.)De Guzman, Susan A. "Preserving the Ancient Rock Art of Angono." Philippine Daily Inquirer, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.