توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Darwin, C. (1850). The Origin of species by means of natural selection: Or The preservation of favored races in the struggle for life. W. B. Conkey.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Darwin, Charles. The Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life. Chicago: W. B. Conkey, 1850.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Darwin, Charles. The Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life. W. B. Conkey, 1850.