1. Put a numerical superscript after the quoted sentence, that is, use "[1]" to indicate the source of the quotation.

2. List all the cited documents in the list of references at the end of the paper, including author, publication year, article title and journal name.

3. In the list of references, each document entry should be arranged in the order of citation, and the corresponding numerical superscript should be added at the end of each entry.

Through the above steps, the citations in the paper can be correctly marked, which is convenient for readers to consult relevant documents and also reflects the author's respect and compliance with academic norms.