APA (7th ed.) Citation

O'Hara, C. W., & Ward, D. R. (1937). An introduction to projective geometry. Oxford University Press.

Chicago Style (17th ed.) Citation

O'Hara, C. W., and D. R. Ward. An Introduction to Projective Geometry. London: Oxford University Press, 1937.

MLA (9th ed.) Citation

O'Hara, C. W., and D. R. Ward. An Introduction to Projective Geometry. Oxford University Press, 1937.