There are many types of references, mainly monographs [M], papers [C], newspaper articles [N], journal articles [J], dissertations [D], reports [R], standards [S], patents [P], papers separated from papers [A] and so on, among which journal articles are the most common.

(2) The number of cited references.

Some magazines may limit the number of references, and the number of references for general academic articles should be 20-40. There are more references in general review articles than in research articles. In addition to the summary, more than 40 references in other articles show that compared with your research results, the discussion and preface may involve too much content and need to be deleted.

(3) the citation format in the text of the reference.

The citation format of references in this paper depends on the requirements of different magazines, which is nothing more than numbers and names.

Numeric numbering is relatively simple, just number the documents one by one according to the order from front to back. In case references need to be added or deleted in the middle, the following figures will change. If we enter references manually, it will be very troublesome. At this time, you need to use endnote software or other software cited in relevant references for help.

Another text reference is the reference of a person's name. Generally speaking, a document belongs to an author, just name the author directly; If there are two authors, the two authors are connected by and; If there are three or more authors, enter the name of the first author, followed by et al. Because et al. means "equality" in Latin, it needs to be italicized and abbreviated, so a dot needs to be added after it.