APA

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

Chicago

Willis J C, . 1940. The course of evolution : by differentiation or divergent mutatin rather than by selection. Cambridge: Cambridge University Press.

Harvard

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

MLA

Willis J C, . The course of evolution : by differentiation or divergent mutatin rather than by selection. Cambridge: Cambridge University Press. 1940.