APA (7th ed.) Citation

Willis, J. C. (1940). The course of evolution, by differentiation or divergent mutation rather than by selection. University Press.

Chicago Style (17th ed.) Citation

Willis, J. C. The Course of Evolution, by Differentiation or Divergent Mutation Rather than by Selection. Cambridge: University Press, 1940.

MLA (8th ed.) Citation

Willis, J. C. The Course of Evolution, by Differentiation or Divergent Mutation Rather than by Selection. University Press, 1940.