1. source reliability: the cited documents should come from authoritative and reliable academic journals, professional books, newspapers and magazines.
2. Timeliness: references should be recent, especially papers on hot topics, and research results in recent years should be cited.
3. Relevance: the cited documents should be related to the theme of the paper or the research content, and the cited materials should be valuable and of great significance to the research.
4. Accuracy: the information in the cited documents should be accurate, including the author's name, document title, publication year, publishing house, page number, etc.
5. Format specification: the format of cited documents must conform to academic specifications, and different citation formats are needed according to different academic fields. Generally speaking, reference formats such as APA, MLA and Chicago can be adopted.
6. Pay attention to the number of citations: the number of citations should be appropriate to avoid too much or too little. Too much will be cumbersome, too little will lack support.
When quoting literature, we should pay attention to the above requirements to ensure the rigor and credibility of the paper. At the same time, we also need to pay attention to academic integrity, and we must not copy or plagiarize other people's research results, otherwise we will be punished academically.