2. Mark the cited position by marking the information of the cited books in this position, including the title, author, publishing unit, publishing time, etc.
3. If multiple books need to be marked at the same time, they can be marked in a certain order, such as alphabetical order of the author's surname or publication time order of the bibliography.
4. It can be quoted by numbers or expressed in writing, such as the format of "XXX mentioned in the work".
5. If tools such as citation detection are used, most tools will automatically identify and mark the citation formats of books and other references.