Cita APA (7a ed.)
(1981). Operational research '81: Proceedings of the 9th IFORS International conference. /Hamburg, Germany, 20.-24.7.1981. North-Holland.
Cita Chicago Style (17a ed.)
Operational Research '81: Proceedings of the 9th IFORS International Conference. /Hamburg, Germany, 20.-24.7.1981. Amsterdam: North-Holland, 1981.
Cita MLA (9a ed.)
Operational Research '81: Proceedings of the 9th IFORS International Conference. /Hamburg, Germany, 20.-24.7.1981. North-Holland, 1981.
Precaución: Estas citas no son 100% exactas.