APA (7th ed.) Zitazioa

DUCKWORTH, W. (1962). Guide to operational research. Methuen.

Chicago Style (17th ed.) Zitazioa

DUCKWORTH, W.E. Guide to Operational Research. London: Methuen, 1962.

MLA (9th ed.) Zitazioa

DUCKWORTH, W.E. Guide to Operational Research. Methuen, 1962.