According to GB3469-83 "Document Types and Document Carrier Codes", reference document types and document types are identified by single letters: monograph M; Newspaper n; Journal j; Patent document p; Compilation g; Ancient books o; Technical standards; Dissertation d; Scientific and technological report; Reference tool k; Search tool w; File b; Tape a;

Chart q; Record l; Product sample x; Video tape v; Meeting minutes; Chinese translation test; Music score I; Movie y; Manuscript h; Microfilm u; Slide z; Miniature flat film f; Other e.

Extended data:

References are continuously coded with Arabic numerals in the order in which they appear in the text, and the serial numbers are placed in square brackets. If the file is referenced repeatedly, it is marked with the same serial number in the text.

Generally speaking, the page number (or page number range) of a document cited once is listed in the following references. The format is "publication year" of the work or "year, volume (issue)"+":page number (or page number range) of the periodical.

For documents cited many times, list the page number or page number range of each place in the serial number tag of each reference (some publications also regard the information that can indicate the location of the cited documents as page numbers) and put them in square brackets (only numbers are listed, and words and characters such as "P" or "page" are not added; The line in the middle of the page number range is a half-word line) and marked with superscript.