1, there are two signature formats: two and one. In the two paragraphs, the object and author of the book are placed above and below respectively, the former is the upper paragraph and the latter is the lower paragraph. The name, source and recipient's name of the content of the work shall be stated in the preceding paragraph, and the year, place and author's name of creation shall be recorded in the next paragraph. In the preceding paragraph, the position should be higher to show respect, including name, title and courtesy name. In the next paragraph, write down the time, place, name and polite expressions. If there is a previous paragraph but there is no previous paragraph, it is called a single paragraph, which may or may not contain the contents of the previous paragraph.