Ackoff, R. L., & And Demery , F. E. (1972). 6n Purposeful systems: An inteerdiciplinary analysis of individual and social behavior as a system of purposeful events.
استشهاد بنمط شيكاغوAckoff, Russell L., و Fred E. And Demery. 6n Purposeful Systems: An Inteerdiciplinary Analysis of Individual and Social Behavior as a System of Purposeful Events. 1972.
MLA استشهادAckoff, Russell L., و Fred E. And Demery. 6n Purposeful Systems: An Inteerdiciplinary Analysis of Individual and Social Behavior as a System of Purposeful Events. 1972.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.