Greenwood, B. (2001). GMA and the SONA. IN Commentary [column]. AmCham Philippines Business Journal.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGreenwood, Bobby. "GMA and the SONA. IN Commentary [column]." AmCham Philippines Business Journal 2001.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGreenwood, Bobby. "GMA and the SONA. IN Commentary [column]." AmCham Philippines Business Journal, 2001.
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