Citazione Stile APA (7a Edizione)
(1981). Operational research '81: Proceedings of the 9th IFORS International conference. /Hamburg, Germany, 20.-24.7.1981. North-Holland.
Citazione stile Chigago Style (17a edizione)
Operational Research '81: Proceedings of the 9th IFORS International Conference. /Hamburg, Germany, 20.-24.7.1981. Amsterdam: North-Holland, 1981.
Citatione MLA (9a ed.)
Operational Research '81: Proceedings of the 9th IFORS International Conference. /Hamburg, Germany, 20.-24.7.1981. North-Holland, 1981.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.