A manual for the prepares and users of Eco-efficiency indicators :  Version 1.1 / 
UNCTAD. 
 - New York :  United Nations,  2004. 
 - 113 p. 
<br/><br/> UNCTAD/ITE/IPC/2003/7  United Nations Publication Sales No. E.04.II.D.13 
<br/><br/><label>ISBN: </label>9211126207 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Foreign trade