MLA

Hawken, Paul. The Ecology of Commerce : How Business Can Save the Planet. London: Weidenfeld & Nicolson, 1993.

APA

Hawken, P. (1993). The ecology of commerce : how business can save the planet. London: Weidenfeld & Nicolson.

Chicago

Hawken, Paul The Ecology of Commerce: How Business Can Save the Planet. London: Weidenfeld & Nicolson, 1993.