此图来自于Virtual Cities Project(https://www.virtualshanghai.net/%E9%A1%B9%E7%9B%AE/%E8%A7%84%E5%88%99%E4%B8%8E%E6%9D%A1%E4%BE%8B)Copyright:[失效链接]
All the documents (texts, images, maps) are made available for free and without any commercial purpose. The vast majority is scattered throughout the world in a form other than the digital format proposed here. The Virtual Cities Project wants to provide the academic community, the wider student community and the general public, with a rich literature on the history and the urban experience in East Asia, primarily China and Vietnam, with due respect of the copyrights of authors. We strongly recommend that users properly cite the documents circulated through the resources of the Virtual Cities Project, giving credit in the first place to the authors of the original documents.