APA (7th ed.) Citation
Puckle, O. (1968). An introduction to numerical control of machine tools. [s.n.].
Chicago Style (17th ed.) Citation
Puckle, O.S. An Introduction to Numerical Control of Machine Tools. [s.l.]: [s.n.], 1968.
MLA (9th ed.) Citation
Puckle, O.S. An Introduction to Numerical Control of Machine Tools. [s.n.], 1968.
Warning: These citations may not always be 100% accurate.