Challenger, M. (2012). On extinction: How we became estranged from nature. Counterpoint : Distributed by Publishers Group West.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Challenger, Melanie. On Extinction: How We Became Estranged from Nature. Berkeley, CA: Counterpoint : Distributed by Publishers Group West, 2012.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Challenger, Melanie. On Extinction: How We Became Estranged from Nature. Counterpoint : Distributed by Publishers Group West, 2012.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.