HILLARY, R. (2000). ISO 14001: Case studies and practical experiences. greenleaf.
Lua i Stíl Chicago (17ú heag.)HILLARY, Ruth. ISO 14001: Case Studies and Practical Experiences. greenleaf, 2000.
Lua MLA (8ú heag.)HILLARY, Ruth. ISO 14001: Case Studies and Practical Experiences. greenleaf, 2000.
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