APA
Charles Darwin, . (2009). The Origin of Species: By Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life. NEW YORK: Cambridge University Press.
Chicago
Charles Darwin, . 2009. The Origin of Species: By Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life. NEW YORK: Cambridge University Press.
Harvard
Charles Darwin, . (2009). The Origin of Species: By Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life. NEW YORK: Cambridge University Press.
MLA
Charles Darwin, . The Origin of Species: By Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life. NEW YORK: Cambridge University Press. 2009.