Lopez, H. E., & Fajutagana, L. M. (1999). At the helm of U.P: Presidential accents (First edition.). Office of the Secretary of the University of the Philippines, University of the Philippines System.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLopez, Helen E., और Leonora M. Fajutagana. At the Helm of U.P: Presidential Accents. First edition. Quezon City: Office of the Secretary of the University of the Philippines, University of the Philippines System, 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLopez, Helen E., और Leonora M. Fajutagana. At the Helm of U.P: Presidential Accents. First edition. Office of the Secretary of the University of the Philippines, University of the Philippines System, 1999.
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