APA (7th ed.) Citation

Stray & Griffiths, D. (2009). Head First 2D Geometry (1st edition.). O'Reilly Media, Inc..

Chicago Style (17th ed.) Citation

Stray and Dawn Griffiths. Head First 2D Geometry. 1st edition. O'Reilly Media, Inc., 2009.

MLA (9th ed.) Citation

Stray and Dawn Griffiths. Head First 2D Geometry. 1st edition. O'Reilly Media, Inc., 2009.

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