1. Direct quotation: If you want to quote the specific content of an author's original text, you need to put quotation marks in the quotation part, and provide the author's name, publication year and page number (if applicable). For example, "According to Smith (20 10),' quote here' (page 45)".
2. Indirect quotation: If you want to quote the author's point of view or summary, but do not directly quote the specific content of the original text, you can use indirect quotation. In this case, you only need to provide the author's name and publication year. For example, "Smith (20 10) thinks that ...".
3. Multiple authors: If there are multiple authors, you can use et al. instead of the names of other authors, but you need to list the names of all authors in the reference list. For example, "Johnson et al. (20 15) found that ...".
4. Multiple articles by the same author: If the same author has published multiple articles in different years, different documents can be distinguished by the year of publication. For example, "Smith (20 10) discovered …" or "Smith (20 12) argued that …".
5. List of references: At the end of the paper, you need to list all the cited references. According to the citation format used (such as APA, MLA, etc. ), you need to list the author's name, publication year, article title, journal name or title, page number and other information in a specific format.
Please note that when quoting references, please ensure that each source is accurately marked and quoted, and follow the provisions of the citation format used. This will help to ensure the academic integrity of your paper and help readers find the original source of your citation.