APA (7th ed.) Citation

Duckworth, W. E., Gear, A. E., & Lockett, A. G. (1977). A guide to operational research ([3rd ed.].). Chapman and Hall.

Chicago Style (17th ed.) Citation

Duckworth, W. E., A. E. Gear, and A. Geoffrey Lockett. A Guide to Operational Research. [3rd ed.]. London: Chapman and Hall, 1977.

MLA (9th ed.) Citation

Duckworth, W. E., et al. A Guide to Operational Research. [3rd ed.]. Chapman and Hall, 1977.