APA (7th ed.) Citation

Duckworth, W. E., Gear, A. E., & Lockett, A. G. (1977). A Guide to Operational Research. Springer Netherlands.

Chicago Style (17th ed.) Citation

Duckworth, W. E., A. E. Gear, and A. G. Lockett. A Guide to Operational Research. Dordrecht: Springer Netherlands, 1977.

MLA (9th ed.) Citation

Duckworth, W. E., et al. A Guide to Operational Research. Springer Netherlands, 1977.