Orig, T. S. (2002). Low investment in vaccines, immunization threatens global health, says report. Manila Bulletin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOrig, Thor S. "Low Investment in Vaccines, Immunization Threatens Global Health, Says Report." Manila Bulletin 2002.
एमएलए (9वां संस्करण) प्रशस्ति पत्रOrig, Thor S. "Low Investment in Vaccines, Immunization Threatens Global Health, Says Report." Manila Bulletin, 2002.
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