APA (7th ed.) Citation

Johnson, P. H. (1968). The survival of the fittest. Macmillan.

Chicago Style (17th ed.) Citation

Johnson, Pamela Hansford. The Survival of the Fittest. London, Melbourne [etc.]: Macmillan, 1968.

MLA (8th ed.) Citation

Johnson, Pamela Hansford. The Survival of the Fittest. Macmillan, 1968.