APA (7th ed.) Citation

Duckworth, W. E. (1965). A guide to operational research (2nd ed.). Chapman and Hall.

Chicago Style (17th ed.) Citation

Duckworth, Walter Eric. A Guide to Operational Research. 2nd ed. London: Chapman and Hall, 1965.

MLA (9th ed.) Citation

Duckworth, Walter Eric. A Guide to Operational Research. 2nd ed. Chapman and Hall, 1965.