(1999). The Environmental goods and services industry: Manual for data collection and analysis. Paris: Organisation for Economic Co-operation and Development.
استشهاد بنمط شيكاغوThe Environmental Goods and Services Industry: Manual for Data Collection and Analysis. Paris: Organisation for Economic Co-operation and Development, 1999.
MLA استشهادThe Environmental Goods and Services Industry: Manual for Data Collection and Analysis. Paris: Organisation for Economic Co-operation and Development, 1999.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.