APA (7th ed.) Citation

Wentworth, G. A. (2010). Plane Geometry. Project Gutenberg.

Chicago Style (17th ed.) Citation

Wentworth, G. A. Plane Geometry. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Wentworth, G. A. Plane Geometry. Project Gutenberg, 2010.

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