Darwin, C. (1872). On the origin of species: By means of natural selection (Sixth edition.). The Floating Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Darwin, Charles. On the Origin of Species: By Means of Natural Selection. Sixth edition. [Auckland, New Zealand]: The Floating Press, 1872.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Darwin, Charles. On the Origin of Species: By Means of Natural Selection. Sixth edition. The Floating Press, 1872.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.