Παραπομπή APA

Weizsacker, E. V. E. (2005). Factor four: Doubling wealth, haling resource use. Earthscan.

Παραπομπή Chicago Style

Weizsacker, Ernst Von Etc. Factor Four: Doubling Wealth, Haling Resource Use. London: Earthscan, 2005.

Παραπομπή MLA

Weizsacker, Ernst Von Etc. Factor Four: Doubling Wealth, Haling Resource Use. Earthscan, 2005.