Proquest Dissections and Sports (PQDT) (1637-), which contains 2.4 million dissertations from more than 0/000 universities in Europe and America, is the largest and most widely used database of dissertations and abstracts in the world. Most papers since 1997 can be found on the first 24 pages)

ProQuest full-text thesis database (some foreign full-text dissertations in PQDT database, with more than 250,000 papers)

The first search -worldcat dissertations (including all doctoral and master's dissertations of OCLC WorldCat, and the published materials based on the papers catalogued by OCLC members, involving all disciplines, mainly from thousands of universities in Europe and America, with more than 8 million doctoral and master's dissertations. From the "Internet resources" of advanced search, we can get nearly 20% of about 6,543.8+0,000 full-text articles, which requires international traffic fees. )