参考文献：COVID-19对旅游业的影响、智能旅游和旅游区域发展

本文列举了关于COVID-19对旅游供应链管理的影响、智能旅游发展和旅游区域发展的相关参考文献，供您参考：

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World Travel & Tourism Council. (2020). WTTC economic impact research. Retrieved from https://wttc.org/Research/Economic-Impact