Berck, P., & Helfand, G. E. (2011). The economics of the environment. PHI Learning.
Chicagoスタイル(17版)引用形式Berck, Peter, , Gloria E. Helfand. The Economics of the Environment. New Delhi: PHI Learning, 2011.
MLA(9版)引用形式Berck, Peter, , Gloria E. Helfand. The Economics of the Environment. PHI Learning, 2011.
警告: この引用は必ずしも正確ではありません.