APA

Hoffmann Ulrich, .Opportunities and constraints for the internalization of environmental costs and benefits: The case of natural and synthetic rubber. : UNCTAD/IRSG Workshop : Opportunities and constraints for the internalization of environmental costs into the price of rubber, 13 June 1997, Liverpool, UK, pp.3-5.

Chicago

Hoffmann Ulrich, .Opportunities and constraints for the internalization of environmental costs and benefits: The case of natural and synthetic rubber. : UNCTAD/IRSG Workshop : Opportunities and constraints for the internalization of environmental costs into the price of rubber, 13 June 1997, Liverpool, UK, pp.3-5.

Harvard

Hoffmann Ulrich, .Opportunities and constraints for the internalization of environmental costs and benefits: The case of natural and synthetic rubber. : UNCTAD/IRSG Workshop : Opportunities and constraints for the internalization of environmental costs into the price of rubber, 13 June 1997, Liverpool, UK, pp.3-5.

MLA

Hoffmann Ulrich, .: UNCTAD/IRSG Workshop : Opportunities and constraints for the internalization of environmental costs into the price of rubber, 13 June 1997, Liverpool, UK, pp.3-5. .