It is essential to quote foreign documents when writing academic papers or reports. Correctly quoting foreign documents can respect and protect the intellectual property rights of the original authors, and also help readers to further consult the contents of relevant documents. The following are some common methods of quoting foreign literature:

1. Monographs, papers and reports: [serial number] Principal. Document Title [Document Type ID]. Place of publication: publisher, year of publication: page number (optional). For example: [1] Smith, J. (2005). Introduction to environmental science. New york: Willie.

2. Journal article: [serial number] Principal. File title [J]. Journal name, publication year, volume number (issue number): start and end page numbers. For example: [2] Brown, A. (2008). Impact of climate change on biodiversity. Nature, 453 (7 196), 123- 127.

3. Network resources: [serial number] Principal. The title of literature. Release date or update date/website.

When quoting, in addition to the title, you should also indicate the periodical or book where the article is located. Different academic fields may have different citation standards, such as APA (American Psychological Association) standard, MLA (American Modern Language Association) standard, Chicago standard and so on. Therefore, before writing, it is recommended to know the citation format required or to be submitted by journals in your field.

In addition, we should pay attention to avoid the misunderstanding of literature citation, for example, the list of literature is too wide or too many, only the literature we have read is listed, and the literature that has nothing to do with the research topic or is not very relevant is ignored. Ensure that the cited documents are closely related to the research content, and really provide strong support for the research and demonstration of the paper.