Darwin, C., & Case, D. (2006). The origin of species by means of natural selection, or, The preservation of favored races in the struggle for life. Tantor Media.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Darwin, Charles, و David Case. The Origin of Species by Means of Natural Selection, or, The Preservation of Favored Races in the Struggle for Life. [S.l.]: Tantor Media, 2006.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Darwin, Charles, و David Case. The Origin of Species by Means of Natural Selection, or, The Preservation of Favored Races in the Struggle for Life. Tantor Media, 2006.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.