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

Extended data:

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: 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 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.

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]

2. The type of electronic document carrier is identified by two letters, as follows:

① magnetic tape [[〔MT〕]

② Disk [[〔DK〕]

③ compact disc [CD]

④ Online network [[〔OL〕]

3. The reference type identification method of electronic document carrier type is [document type identification/carrier type identification]. For example:

① Online online database [DB/OL]

② Tape database [DB/MT]

(3) CD-ROM books

④ Disk software [CP/DK]

⑤ Network Journals [J/OL]

⑥ Online electronic bulletin [EB/OL]

Baidu Encyclopedia-Document Types and Document Carrier Codes