(2015). one step ahead: Towards environmental sustainability. united nation.
Chicagoスタイル(17版)引用形式One Step Ahead: Towards Environmental Sustainability. cairo: united nation, 2015.
MLA(9版)引用形式One Step Ahead: Towards Environmental Sustainability. united nation, 2015.
警告: この引用は必ずしも正確ではありません.