According to GB3469-83 "File Type and File Carrier Code", it is identified by a single letter:

M- Monographs (including works on history and chronicles 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

Electronic document types are identified by two letters:

database

computer program

Electronic bulletin

For electronic documents with non-paper carriers, the carrier type shall be indicated in the reference mark:

A database on an online network

Database/tape database

M/CD-CD books

CP/DK disk software

J/OL- online log

EB/ol- online electronic bulletin

First, the description format of references

1, author of the journal. Title [J] Name of publication, year of publication, volume (issue): page numbers.

2. Monograph author. Title [M]. Version (first edition not recorded). Place of publication: publisher, year of publication.

: Start and end page numbers

3. Author, title [c], place of editing and publication: publisher, year of publication:

Starting and ending page number

4. Author of the paper. Title [D] Save the location. Save unit. Year.

5. Title of the patent document [P]. Country. Types of patent documents. Patent number. publication date

6. Standard number. Standard name

7. newspaper author. Title. Newspaper name. Publication date (version)

8. Author of the report. Title [R]. Save the location and year.

9. Author of electronic document. Title [Identification of electronic documents and carrier types]. The source and date of the document.

10, there are more than three authors, and only three have been written.

Second, the types of documents and their identification

1, according to the provisions of GB3469, various commonly used documents are identified as follows:

(1) Journal [j]

(2) Monograph [m]

(3) Essay [c]

④ Dissertation [D]

⑤ patent [p]

⑥ standard

All landowners newspaper

⑧ Technical report [r]