Books: documents published in the form of books, including monographs, teaching materials, popular science books, etc.

Periodical: a continuous publication published regularly, including academic periodicals and industry periodicals.

Patent documents: documents that record inventions and are protected by law, including invention patents, utility model patents, design patents, etc.

Standard document: a document issued by an authoritative organization that specifies technical requirements and management requirements in a certain field, including international standards, national standards and industry standards.

Dissertation: Theses written by students of institutions of higher learning or research institutions for obtaining degrees, including bachelor's dissertations, master's dissertations, doctoral dissertations, etc.

Meeting documents: documents that record the contents of the meeting and publish them publicly, including meeting papers and meeting reports.

Scientific and technological report: a document that records scientific research projects or technological achievements, including research reports and technical reports.

Product information: a document that introduces the product structure, performance and use, including product specifications and product catalogs.

Archives: documents that record the history and activities of institutions or individuals, including government institutions, enterprises and individuals.

Government publications: official documents, reports, statistical data and other documents issued by government agencies, including government bulletins and government work reports.

These different types of documents have important reference value in academic research, technology development, policy formulation and so on. When writing a paper or conducting other academic research, you need to cite relevant documents to support your own views and arguments, and at the same time, you should pay attention to quoting norms to avoid plagiarism and infringement.