APA (7th ed.) Citation

Poincaré, H. (2011). Science and hypothesis. Project Gutenberg.

Chicago Style (17th ed.) Citation

Poincaré, Henri. Science and Hypothesis. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Poincaré, Henri. Science and Hypothesis. Project Gutenberg, 2011.

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