• Full text available at: Gale Cengage Educator''s Reference Complete
• Available from 04/01/2000.
  
• Full text available at: Gale Opposing Viewpoints in Context
• Available from 04/01/2000.
  
• Full text available at: JSTOR Health & General Sciences
• Available from 1972 volume: 1.
  Most recent 1 year(s) not available.
  
• Full text available at: JSTOR Life Sciences Collection
• Available from 1972 volume: 1 until 2012 volume: 120 issue: 12.
  
• Full text available at: PubMed Central
• Available from 1972 volume: 1.
  
• Full text available at: PubMed Central Open Access
• Available from 1972 volume: 1.
  
• Full text available at: DOAJ Directory of Open Access Journals
• Available from 1972.
  
• Full text available at: EBSCOhost Academic Search Complete
• Available from 1999.
  
• Full text available at: EBSCOhost CINAHL Complete
• Available from 2006.
  
• Full text available at: EBSCOhost Environment Complete
• Available from 1999.
  
• Full text available at: EBSCOhost GreenFile
• Available from 1999.
  
• Full text available at: US Government Documents
• Available from 1972 volume: 2.
  

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