APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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