„Birodalom” változatai közötti eltérés

===Angol nyelvű===

*Gilpin, Robert ''[http://books.google.it/books?id=2iKL7zr3kl0C War and Change in World Politics]'' pp.110–116

|url=http://www.transcend.org/galt.htm

|title=The Decline and Fall of Empires: A Theory of De-Development

|format={{dead link|date=April 2009}} – ^{[http://scholar.google.co.uk/scholar?hl=en&lr=&q=intitle%3AThe+Decline+and+Fall+of+Empires%3A+A+Theory+of+De-Development&as_publication=&as_ylo=1996&as_yhi=1996&btnG=Search Scholar search]}

|unused_data=|month-January}} Written for the United Nations Research Institute on Development, UNRISD, Geneva.

|last1=Lens

|first1=Sidney