APA (7e ed.) Bronvermelding

(2015). one step ahead: Towards environmental sustainability. united nation.

Chicago (17e ed.) Bronvermelding

One Step Ahead: Towards Environmental Sustainability. cairo: united nation, 2015.

MLA (9e ed.) Bronvermelding

One Step Ahead: Towards Environmental Sustainability. united nation, 2015.

Let op: Deze citaties zijn niet altijd 100% accuraat.