APA (7th ed.) Citation

Ball, W. W. R. (1972). An essay on Newton's "Principia".

Chicago Style (17th ed.) Citation

Ball, W. W. Rouse. An Essay on Newton's "Principia". 1972.

MLA (9th ed.) Citation

Ball, W. W. Rouse. An Essay on Newton's "Principia". 1972.

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