Gaya APA
Ackoff, Russell L., Emery, Fred E.. (1972).
On Purposeful systems (1st. Ed).
London:
Tavistock Pub.
Gaya Chicago
Ackoff, Russell L., Emery, Fred E..
On Purposeful systems.
1st. Ed
London:
Tavistock Pub,
1972.
Text.
Gaya MLA
Ackoff, Russell L., Emery, Fred E..
On Purposeful systems.
1st. Ed
London:
Tavistock Pub,
1972.
Text.
Gaya Turabian
Ackoff, Russell L., Emery, Fred E..
On Purposeful systems.
1st. Ed
London:
Tavistock Pub,
1972.
Print.