Bangaoil, G. Q. (1991). Ortigas towards the 21st century / Grace Q. Bangaoil. Manila Times.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBangaoil, Grace Q. "Ortigas Towards the 21st Century / Grace Q. Bangaoil." Manila Times 1991.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBangaoil, Grace Q. "Ortigas Towards the 21st Century / Grace Q. Bangaoil." Manila Times, 1991.
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