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For any form of publication, please include this link:
http://maps.grida.no/go/graphic/comparison-of-global-river-ni
trogen-export-from-natural-ecosystems-agricultural-systems-a
nd-sewage-e

Please give the cartographer/designer/author credit (in this case Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal) and give full recognition to the data sources used in the graphic.

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Here are some suggestions for the the proper citation, in a number of styles that can just be copied and pasted into any documents. This is based on the template provided by Wikipedia. For reference to any printed material, please see the details of the collection or collections this graphic is published in, which may be published in paper format.

• APA style

  Comparison of global river nitrogen export from natural ecosystems, agricultural systems, and sewage effluents, 1975 and 1990. (2005). In UNEP/GRID-Arendal Maps and Graphics Library. Retrieved 15:47, February 9, 2012 from http://maps.grida.no/go/graphic/comparison-of-global-river-nitrogen-export-from-natural-ecosystems-agricultural-systems-and-sewage-e.

• MLA style

  "Comparison of global river nitrogen export from natural ecosystems, agricultural systems, and sewage effluents, 1975 and 1990." UNEP/GRID-Arendal Maps and Graphics Library. 2005. UNEP/GRID-Arendal. 9 Feb 2012 <http://maps.grida.no/go/graphic/comparison-of-global-river-nitrogen-export-from-natural-ecosystems-agricultural-systems-and-sewage-e>.

• MHRA style

  UNEP/GRID-Arendal, 'Comparison of global river nitrogen export from natural ecosystems, agricultural systems, and sewage effluents, 1975 and 1990', UNEP/GRID-Arendal Maps and Graphics Library, 2005, <http://maps.grida.no/go/graphic/comparison-of-global-river-nitrogen-export-from-natural-ecosystems-agricultural-systems-and-sewage-e> [Accessed 9 February 2012]

• Chicago style

  UNEP/GRID-Arendal, Comparison of global river nitrogen export from natural ecosystems, agricultural systems, and sewage effluents, 1975 and 1990, UNEP/GRID-Arendal Maps and Graphics Library, http://maps.grida.no/go/graphic/comparison-of-global-river-nitrogen-export-from-natural-ecosystems-agricultural-systems-and-sewage-e (Accessed 9 February 2012)

• CBE/CSE style

  UNEP/GRID-Arendal. Comparison of global river nitrogen export from natural ecosystems, agricultural systems, and sewage effluents, 1975 and 1990 [Internet]. UNEP/GRID-Arendal Maps and Graphics Library; 2005 [cited 2012 Feb 9]. Available from: http://maps.grida.no/go/graphic/comparison-of-global-river-nitrogen-export-from-natural-ecosystems-agricultural-systems-and-sewage-e.

• Bluebook style

  Comparison of global river nitrogen export from natural ecosystems, agricultural systems, and sewage effluents, 1975 and 1990, http://maps.grida.no/go/graphic/comparison-of-global-river-nitrogen-export-from-natural-ecosystems-agricultural-systems-and-sewage-e (Last visited February 9, 2012).

• Bluebook: Harvard JOLT style

  See UNEP/GRID Arendal Maps and Graphics Library, Comparison of global river nitrogen export from natural ecosystems, agricultural systems, and sewage effluents, 1975 and 1990, http://maps.grida.no/go/graphic/comparison-of-global-river-nitrogen-export-from-natural-ecosystems-agricultural-systems-and-sewage-e (Optional description here) (as of Feb. 9, 2012, 14:47 UTC).

• AMA style

  UNEP/GRID-Arendal. Comparison of global river nitrogen export from natural ecosystems, agricultural systems, and sewage effluents, 1975 and 1990. UNEP/GRID-Arendal Maps and Graphics Library. 2005. Available at: http://maps.grida.no/go/graphic/comparison-of-global-river-nitrogen-export-from-natural-ecosystems-agricultural-systems-and-sewage-e. Accessed February 09, 2012.