・UMD Online Catalog - You can the UMD Libraries' holdings of books, eBooks, journals, newspapers, and much more.
・Database of Chinese Rare Books Collected in Japan - Maintained by the Center for Informatics in East Asian Studies, Institute for Research in Humanities, Kyoto University, Japan. It offers index for Chinese books (漢籍) held by Japanese institutions.
・National Central Library [國家圖書館]
・National Library of China & National Digital Library of China [中国国家图书馆]