Monographs are usually the author's statement of "one family" and his own views and understanding, rather than simply stating many statements; Monographs are generally long and can be discussed in depth and comprehensively around larger and complex issues. They have the characteristics of extensive content, systematic discussion and mature views. They are generally the embodiment of important scientific research achievements and have high academic reference value.
According to the specific and different contents of publications, they can be divided into books, serial publications and special documents. Books: Any document that is more than 48 pages long and constitutes a bibliographic unit is called a book.
Continuous publications: including periodicals (including core periodicals), newspapers and annual publications.
Special documents: special issue documents, standard documents, dissertations, scientific reports, conference documents, government publications, archives and product materials.