APA

(2003). How many species will survive the 21st century?. London: DEFRA.

Chicago

2003. How many species will survive the 21st century?. London: DEFRA.

Harvard

(2003). How many species will survive the 21st century?. London: DEFRA.

MLA

How many species will survive the 21st century?. London: DEFRA. 2003.