Reference type:
According to GB3469-83 "File Type and File Carrier Code", it is identified by a single letter:
M-Monographs (including historical records in ancient books)?
Essays
Newspaper articles
Journal articles
Doctoral dissertation
R- research report
S standard
patent
A—— Precipitated documents in monographs and papers.
Z—— Other unspecified literature types
Extended data:
Description format of references
1? , journal author. Title [J] Title, year of publication, volume (issue): page numbers.
2. Monograph author. Title [m]. Version (first edition not recorded). Place of publication: publisher, year of publication: page number.
3. Author, title [c] and editing procedure, name procedure, place of publication: publisher, year of publication: start and end pages.
4? Author of the paper. Title [D] Save the location. Save unit. Year.
5? Title of patent document [P]. Country. Types of patent documents. Patent number. publication date