APA (7th ed.) Citation

Darwin, C. (1993). The origin of species (1st pbk. ed.). Random House.

Chicago Style (17th ed.) Citation

Darwin, Charles. The Origin of Species. 1st pbk. ed. New York: Random House, 1993.

MLA (9th ed.) Citation

Darwin, Charles. The Origin of Species. 1st pbk. ed. Random House, 1993.