Lopez, E. H. (2001). Increasing developmet by local firms of leading electronics billing sol'n area. Manila Bulletin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLopez, Edu H. "Increasing Developmet by Local Firms of Leading Electronics Billing Sol'n Area." Manila Bulletin 2001.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLopez, Edu H. "Increasing Developmet by Local Firms of Leading Electronics Billing Sol'n Area." Manila Bulletin, 2001.
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