APA-referens

(2011). Keeping track of our changing environment from Rio to Rio + 20 (1992-2012). UNEP.

Chicago-stil citat

Keeping Track of Our Changing Environment from Rio to Rio + 20 (1992-2012). Nairobi: UNEP, 2011.

MLA-referens

Keeping Track of Our Changing Environment from Rio to Rio + 20 (1992-2012). UNEP, 2011.

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