Hawken, P. (1993). The ecology of commerce: How business can save the planet. London: Weidenfeld & Nicolson.
Lua i Stíl Chicago (17ú heag.)Hawken, Paul. The Ecology of Commerce: How Business Can Save the Planet. London: Weidenfeld & Nicolson, 1993.
Lua MLA (8ú heag.)Hawken, Paul. The Ecology of Commerce: How Business Can Save the Planet. London: Weidenfeld & Nicolson, 1993.
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