APA (7th ed.) Citation

Ryan, M. (2019). Geometry essentials (1st edition.). For Dummies.

Chicago Style (17th ed.) Citation

Ryan, Mark. Geometry Essentials. 1st edition. Hoboken, New Jersey: For Dummies, 2019.

MLA (9th ed.) Citation

Ryan, Mark. Geometry Essentials. 1st edition. For Dummies, 2019.