For example: [1] Liu Guojun, Chen Shaoye. Book catalogue [M]. Beijing: Higher Education Press,1957:15-18.
According to the types of reference materials, it can be divided into monographs [M], conference proceedings [C], newspaper articles [N], journal articles [J], dissertations [D], reports [R], standards [S], patents [P], precipitation documents [A] and magazines [G].
Extended data:
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For many cited documents, the page number or page number range of each reference is listed in the serial number tag (some publications also regard the information that can indicate the location of the cited documents as page numbers), which is placed in square brackets (only numbers are listed, and words and characters before and after "P" or "page" are not added) and marked with superscript.
The requirements of the listed reference documents are:
The references listed in 1. should be official publications to facilitate readers' textual research.
2. The listed references shall be marked with serial numbers, titles of works or articles, authors and publication information.
Baidu Encyclopedia-Reference Standard Format