Library: Books in the library are the main source of traditional reference documents, which are more convenient and affordable than other traditional methods.

2. China HowNet

China Knowledge Network (CNKI) is the authoritative source of online literature. Most colleges and universities have cooperated with China Knowledge Network, and they can download literature for free on campus, but they need to pay fees outside campus. Enter the title of the document in the classified catalogue or retrieval area of China HowNet official website, and you can find the required document.

3.VIP journals

Using advanced retrieval in VIP journals, you can find the articles you need accurately. Search method: enter the document name or keywords in the search area on the home page.

4. Wanfang Database

Wanfang data system divides the database into five subsystems: full-text dissertations, full-text conference papers, digital journals, scientific and technological information and business information. Search Method: Click Advanced Search next to Home Search to enter the search area.