1. Literature source: References must be credible and authoritative publications, including academic journals, conference proceedings, monographs and dissertations.
2. Format specification: References need to be written in a prescribed format, generally including the author, title, publication name, publication year, page number and other information. Different disciplines may have different requirements for reference formats, which need to be adjusted according to specific conditions.
3. Accuracy and completeness: References need to accurately quote the information in the original documents, and at the same time, they need to list all necessary information completely to avoid affecting readers' search and understanding due to lack of information.
4. Number of references: The number of references should meet academic requirements, generally more than 20, depending on the research field, research depth and research object.
5. Citation method: When citing references, pay attention to the format and method, generally including direct citation, indirect citation and secondary citation, which need to be accurate and clear.
In a word, reference is an important part of the paper, which reflects the author's academic accomplishment and research level and needs to be paid attention to. In the process of writing, it is necessary to record the cited literature information in time and arrange and typeset it as required.