WGBH (Television station : Boston, Mass.), WGBH Educational Foundation, & Sawyer, F. (2009). Ten trillion and counting. WGBH Educational Foundation ; Distributed by PBS Home Video.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWGBH (Television station : Boston, Mass.), WGBH Educational Foundation, और Forrest Sawyer. Ten Trillion and Counting. Boston, Mass. : Alexandria, Va.: WGBH Educational Foundation ; Distributed by PBS Home Video, 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWGBH (Television station : Boston, Mass.), et al. Ten Trillion and Counting. WGBH Educational Foundation ; Distributed by PBS Home Video, 2009.
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