APA
(2007). 2007 State of the world. London: W.W Norton & Company.
Chicago
2007. 2007 State of the world. London: W.W Norton & Company.
Harvard
(2007). 2007 State of the world. London: W.W Norton & Company.
MLA
2007 State of the world. London: W.W Norton & Company. 2007.