APA (7th ed.) Citation

Chapple, W. A., & Waddell, R. (2005). The Fertility of the Unfit. Project Gutenberg.

Chicago Style (17th ed.) Citation

Chapple, W. A., and Rutherford Waddell. The Fertility of the Unfit. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Chapple, W. A., and Rutherford Waddell. The Fertility of the Unfit. Project Gutenberg, 2005.

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