• Full text available at: Agricultural Science Database
• Available from 2006.
  
• Full text available at: Gale In Context: Opposing Viewpoints
• Available from 12/20/2006.
  
• Full text available at: Public Library of Science (PLoS) Journals Open Access
• Available from 2006 volume: 1 issue: 1.
  
• Full text available at: DOAJ Directory of Open Access Journals
• Available from 2006.
  
• Full text available at: EBSCOhost Academic Search Complete
• Available from 2008.
  
• Full text available at: PubMed Central
• Available from 2006 volume: 1.
  
• Full text available at: PubMed Central Open Access
• Available from 2006 volume: 1.
  

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