BusinessWorld Pub. Corp. (2007). BusinessWorld top 1000 corporations in the Philippines, 2007. BusinessWorld Pub. Corp.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBusinessWorld Pub. Corp. BusinessWorld Top 1000 Corporations in the Philippines, 2007. Quezon City: BusinessWorld Pub. Corp, 2007.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBusinessWorld Pub. Corp. BusinessWorld Top 1000 Corporations in the Philippines, 2007. BusinessWorld Pub. Corp, 2007.
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