APA (7th ed.) Citation

Lehmer, D. N. An Elementary Course in Synthetic Projective Geometry.

Chicago Style (17th ed.) Citation

Lehmer, Derrick Norman. An Elementary Course in Synthetic Projective Geometry.

MLA (9th ed.) Citation

Lehmer, Derrick Norman. An Elementary Course in Synthetic Projective Geometry.

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