@book{ BA34848711,
 author = "United Nations Conference on Environment and Development and World Travel & Tourism Council and World Tourism Organization and Earth Council",
 title = "Agenda 21 for the travel & tourism industry : towards environmentally sustainable development",
 publisher = "[s.n.]",
 year = "1996",
 URL = "https://ci.nii.ac.jp/ncid/BA34848711"
}
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