APA (7th ed.) Citation

Cajori, F. (2010). A History of Mathematics. Project Gutenberg.

Chicago Style (17th ed.) Citation

Cajori, Florian. A History of Mathematics. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Cajori, Florian. A History of Mathematics. Project Gutenberg, 2010.

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