Why doesn’t Chen Yinke use the title of his book?

Chen Yinke is a person’s name. The title number can be added to the name of a book. Chen Yinke is a person's name, so no title number is needed. Book title numbers are punctuation marks used to indicate book titles, chapter titles, newspaper titles, file names, opera titles, song titles, picture titles, etc. They are also used in songs, movies, TV series and other literary and artistic works that are closely related to written media.