Helm, D. (2015). Natural capital: Valuing our planet. Yale University Press.
Chicagoスタイル(17版)引用形式Helm, Dieter. Natural Capital: Valuing Our Planet. New Haven: Yale University Press, 2015.
MLA(9版)引用形式Helm, Dieter. Natural Capital: Valuing Our Planet. Yale University Press, 2015.
警告: この引用は必ずしも正確ではありません.