Cita APA (7th ed.)

Duckworth, W. E. (1965). A Guide to operational research. Methuen.

Cita Chicago (17th ed.)

Duckworth, W. E. A Guide to Operational Research. London: Methuen, 1965.

Cita MLA (9th ed.)

Duckworth, W. E. A Guide to Operational Research. Methuen, 1965.