APA (7th ed.) Citation

Duckworth, W. E., Gear, A. E., & Lockett, A. G. (1978). A guide to operational research (3rd ed.). Chapman and Hall [etc.].

Chicago Style (17th ed.) Citation

Duckworth, W. E., A. E. Gear, and A. Geoffrey Lockett. A Guide to Operational Research. 3rd ed. London [etc.]: Chapman and Hall [etc.], 1978.

MLA (9th ed.) Citation

Duckworth, W. E., et al. A Guide to Operational Research. 3rd ed. Chapman and Hall [etc.], 1978.