(2011). Keeping track of our changing environment from Rio to Rio + 20 (1992-2012). UNEP.
Stile di citazione ChicagoKeeping Track of Our Changing Environment from Rio to Rio + 20 (1992-2012). Nairobi: UNEP, 2011.
Citazione MLAKeeping Track of Our Changing Environment from Rio to Rio + 20 (1992-2012). UNEP, 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.