APA

Darwin C. R., Darwin C. R., . (1952). The origin of species by means of natural selection: The descent of man and selection in relation to sex. Chicago: Encyclopædia Britannica.

Chicago

Darwin Charles Robert, Darwin Charles Robert, . 1952. The origin of species by means of natural selection: The descent of man and selection in relation to sex. Chicago: Encyclopædia Britannica.

Harvard

Darwin C. R., Darwin C. R., . (1952). The origin of species by means of natural selection: The descent of man and selection in relation to sex. Chicago: Encyclopædia Britannica.

MLA

Darwin Charles Robert, Darwin Charles Robert, . The origin of species by means of natural selection: The descent of man and selection in relation to sex. Chicago: Encyclopædia Britannica. 1952.