APA (7th ed.) Citation

Duckworth, W. E. (1962). A guide to operational research. Chapman and Hall.

Chicago Style (17th ed.) Citation

Duckworth, Walter Eric. A Guide to Operational Research. London: Chapman and Hall, 1962.

MLA (9th ed.) Citation

Duckworth, Walter Eric. A Guide to Operational Research. Chapman and Hall, 1962.