http://www.sustainability.vic.gov.au/services-and-advice/business/smarter-resources-smarter-business/energy-and-materials/case-studies
 
this is extra link 
 1- but the reference  like harvard  
2- do not copy make paraphrase  and  i but comment  the teacher in the word  
you can change any thing but  you must includ  this topic 
--- i need it in monday