TY  - BOOK
AU  - Darwin,Charles
TI  - The origin of species by means of natural selection.: The descent of man and selection in relation to sex. 
PY  - 1952///
CY  - Chicago
PB  - Encyclopædia Britannica
KW  - Evolution (Biology)
KW  - Natural selection
KW  - Heredity
KW  - Human beings
KW  - Origin
ER  -