APA
Clark H., United Nations Association of Great Britain and Northern Ireland, . (2015). Climate 2020: facing the future. London: UNA-UK.
Chicago
Clark Helen, United Nations Association of Great Britain and Northern Ireland, . 2015. Climate 2020: facing the future. London: UNA-UK.
Harvard
Clark H., United Nations Association of Great Britain and Northern Ireland, . (2015). Climate 2020: facing the future. London: UNA-UK.
MLA
Clark Helen, United Nations Association of Great Britain and Northern Ireland, . Climate 2020: facing the future. London: UNA-UK. 2015.