Citazione APA

Worlwatch Institute. (2008). State of the world 2008, Innovation for a Sustainable economy ( Photostat copy).

Stile di citazione Chicago

Worlwatch Institute. State of the World 2008, Innovation for a Sustainable Economy ( Photostat Copy). Newyork, W W Norton Co, 2008.

Citazione MLA

Worlwatch Institute. State of the World 2008, Innovation for a Sustainable Economy ( Photostat Copy). 2008.