Gaya APA

Swanson, C, P., Hawken, P. (1993). The ecology of commerce a declaration of sustainability . New York: New York: Harper Collins; 1993.

Gaya MLA

Swanson, Carl, P.., Hawken, Paul. "The ecology of commerce a declaration of sustainability". New York: New York: Harper Collins; 1993, 1993. Text.