Cita APA

Ackoff, R. L., & Emery, F. E. (1972). On purposeful systems. Aldine-Atherton.

Citación estilo Chicago

Ackoff, Russell Lincoln, and F. E. Emery. On Purposeful Systems. Chicago: Aldine-Atherton, 1972.

Cita MLA

Ackoff, Russell Lincoln, and F. E. Emery. On Purposeful Systems. Chicago: Aldine-Atherton, 1972.