Não informado. (1950). Operational Research Quarterly. Operational Research Club.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Operational Research Quarterly. London: Operational Research Club, 1950.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Operational Research Quarterly. Operational Research Club, 1950.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.