APA (7th ed.) Citation

Willis, J. C. (1940). The course of evolution by differentiation or divergent mutation rather than by selection. The University press; [Macmillan].

Chicago Style (17th ed.) Citation

Willis, J. C. The Course of Evolution by Differentiation or Divergent Mutation Rather than by Selection. Cambridge [England] : [New York]: The University press; [Macmillan], 1940.

MLA (9th ed.) Citation

Willis, J. C. The Course of Evolution by Differentiation or Divergent Mutation Rather than by Selection. The University press; [Macmillan], 1940.