WGBH (Television station : Boston, Mass.), WGBH Educational Foundation, & Sawyer, F. (2009). Ten trillion and counting. WGBH Educational Foundation ; Distributed by PBS Home Video.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)WGBH (Television station : Boston, Mass.), WGBH Educational Foundation, و Forrest Sawyer. Ten Trillion and Counting. Boston, Mass. : Alexandria, Va.: WGBH Educational Foundation ; Distributed by PBS Home Video, 2009.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)WGBH (Television station : Boston, Mass.), et al. Ten Trillion and Counting. WGBH Educational Foundation ; Distributed by PBS Home Video, 2009.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.