(1999). Environmental management: How far than the road are you. Philippine Daily Inquirer.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र"Environmental Management: How Far than the Road Are You." Philippine Daily Inquirer 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्र"Environmental Management: How Far than the Road Are You." Philippine Daily Inquirer, 1999.
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