The Economist Intelligence Unit. (1999). Best practices: Environment. Univerties Press.
Chicagoスタイル(17版)引用形式The Economist Intelligence Unit. Best Practices: Environment. India: Univerties Press, 1999.
MLA(8版)引用形式The Economist Intelligence Unit. Best Practices: Environment. Univerties Press, 1999.
警告: この引用は必ずしも正確ではありません.