Villanueva, M. A. (2001). Banker named energy chief / Marichu Villanueva and Donnabelle Gatcula. Philippine Star.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रVillanueva, Marichu A. "Banker Named Energy Chief / Marichu Villanueva and Donnabelle Gatcula." Philippine Star 2001.
एमएलए (9वां संस्करण) प्रशस्ति पत्रVillanueva, Marichu A. "Banker Named Energy Chief / Marichu Villanueva and Donnabelle Gatcula." Philippine Star, 2001.
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