What are the meanings of [M] and [J] in the literature?

In the references, [M] stands for monograph and [J] stands for periodical paper.

The specific expression of the quotation is as follows:

1, monograph

[serial number] Principal. Title of the document [Document Type ID]. Place of publication: publisher, year of publication. Page number (optional).

Liu Guojun, Chen Shaoye. Library catalogue [M]. Beijing: Higher Education Press,1957.15-18.

2. periodicals

【 Serial number 】 Principal responsible person. File title [J]. Publication name, year, volume (issue): page numbers.

[1] He Lingxiu. Read the history of Nanming [J]. Study on the History of China, 1998, (3): 167- 173.

Extended data

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

1, monograph m; Newspaper n; Journal j; Patent document p; Compilation g; Ancient books o; Technical standards;

2. dissertation d; Scientific and technological report; Reference tool k; Search tool w; File b; Tape a;

3. chart q; Record l; Product sample x; Video tape v; Meeting minutes; Chinese translation test;

4. music score I; Movie y; Manuscript h; Microfilm u; Slide z; Miniature flat film f; Other e.

Baidu Encyclopedia-References