Gatdula, L. S. (1999). Roy Alvarez says healing the environment starts with M.E. Philippine Daily Inquirer.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGatdula, Leah Salterio. "Roy Alvarez Says Healing the Environment Starts with M.E." Philippine Daily Inquirer 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGatdula, Leah Salterio. "Roy Alvarez Says Healing the Environment Starts with M.E." Philippine Daily Inquirer, 1999.
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