APA (7th ed.) Citation

Knowlton, C., Besant, A., & Bradlaugh, C. (2011). Fruits of Philosophy A Treatise on the Population Question. Project Gutenberg.

Chicago Style (17th ed.) Citation

Knowlton, Charles, Annie Besant, and Charles Bradlaugh. Fruits of Philosophy A Treatise on the Population Question. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Knowlton, Charles, et al. Fruits of Philosophy A Treatise on the Population Question. Project Gutenberg, 2011.

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