(1998). Lichauco retained as undersecretary. Philippine Star.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र"Lichauco Retained as Undersecretary." Philippine Star 1998.
एमएलए (9वां संस्करण) प्रशस्ति पत्र"Lichauco Retained as Undersecretary." Philippine Star, 1998.
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