Dyfyniad APA

Meadows, D. H., & Wright, D. (2008). Thinking in systems: A primer. Chelsea Green Pub..

Dyfyniad Arddull Chicago

Meadows, Donella H., and Diana Wright. Thinking in Systems: A Primer. White River Junction, Vt.: Chelsea Green Pub., 2008.

Dyfyniad MLA

Meadows, Donella H., and Diana Wright. Thinking in Systems: A Primer. Chelsea Green Pub., 2008.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.