United Nations Environment Programme. Industry and Environment. (1997). Product Development and the Environment: Volume 20, No. 1 - 2, January - June 1997, Double issue.
Чикаго маягийн жагсаалтUnited Nations Environment Programme. Industry and Environment. Product Development and the Environment: Volume 20, No. 1 - 2, January - June 1997, Double Issue. Paris, 1997.
MLA ишлэлUnited Nations Environment Programme. Industry and Environment. Product Development and the Environment: Volume 20, No. 1 - 2, January - June 1997, Double Issue. 1997.
Warning: These citations may not always be 100% accurate.