Literature information resources refer to monographs, academic papers, patent specifications, scientific and technological reports, etc. , based on scientific research, new achievements in work practice, new knowledge and experience summary, entered the public after processing and creation. It is the most basic document information resource.

It provides new ideas, new inventions, new technologies and new achievements, has creative characteristics, has direct reference, reference and use value, and is the main information resource for people to search and use.

2. Secondary literature information resources

The secondary literature information resource refers to the processing, sorting, refining and organizing of the scattered and disordered primary literature in a specific range according to the actual needs and certain scientific methods, making it a system convenient for storage and retrieval, and a tool specially used for consulting the primary literature, information clues and core knowledge. Including bibliography, index, abstract, library catalogue, etc. It is a tool information resource for literature retrieval.

3. Three documents and information resources

Third-level literature information resources refer to the clues provided by second-level literature. A large number of first-level literature are selected and collected according to a certain subject, a certain kind of problem, a certain topic, a certain thing and so on. , comprehensive analysis, overall evaluation and systematic research, and written into a subject book. Including reviewing research and reference tools,

Such as: thematic review, dynamic review, progress report, encyclopedia, yearbook, manual, etc. The content is comprehensive, targeted, systematic, wide in knowledge and large in information, providing reference for people's study and research.