According to GB3469-83 "File Types and File Carrier Codes", reference file types and file types are identified by a single letter:

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.

Expand the purpose of reference description

1, which reflects the author's scientific attitude, shows that the paper has real and extensive scientific basis, and also reflects the starting point and depth of the paper.

2. It is convenient to distinguish the author's achievements from others' research achievements. Although the research results reported in the paper are the author's own, it is inevitable to quote the previous research results in the process of elaboration and demonstration.

3. It can serve as an index. Readers can easily access a series of research materials related to this research direction by retrospective method through recorded references.

4. It can save the length of the article. Some contents that need to be expressed in the paper do not need to be explained in detail in the existing literature, but only need to be recorded at the end of the paper.

5. It is helpful for scientific and technological information personnel to carry out information research and bibliometrics research.

Baidu Encyclopedia-References