Cita APA (7a ed.)

Duckworth, W. E. (1962). A guide to operational research. Methuen & Co.

Cita Chicago Style (17a ed.)

Duckworth, W. E. A Guide to Operational Research. London: Methuen & Co, 1962.

Cita MLA (9a ed.)

Duckworth, W. E. A Guide to Operational Research. Methuen & Co, 1962.