APA (7th ed.) Citation

Weismann, A., & McCormack, T. J. (2010). On Germinal Selection as a Source of Definite Variation. Project Gutenberg.

Chicago Style (17th ed.) Citation

Weismann, August, and Thomas J. McCormack. On Germinal Selection as a Source of Definite Variation. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Weismann, August, and Thomas J. McCormack. On Germinal Selection as a Source of Definite Variation. Project Gutenberg, 2010.

Warning: These citations may not always be 100% accurate.