National Geographic Channel (Television station : Washington, D.C.), BBC Worldwide Americas, Inc, & Stewart, I. S. (2008). Earth: The biography. Distributed by BBC Worldwide Americas ; Distributed by Warner Home Video.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Geographic Channel (Television station : Washington, D.C.), Inc BBC Worldwide Americas, و Iain S. Stewart. Earth: The Biography. [New York, NY] : Burbank, CA: Distributed by BBC Worldwide Americas ; Distributed by Warner Home Video, 2008.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)National Geographic Channel (Television station : Washington, D.C.), et al. Earth: The Biography. Distributed by BBC Worldwide Americas ; Distributed by Warner Home Video, 2008.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.