The reference cited in a paper refers to the whole reference or reference to a book or paper in the process of academic research. Literature information resources include: books, serial publications (periodicals, newspapers, etc. ), brochures, papers, patents, standards, meeting minutes, government publications, etc.
The National Standard Document Types and Document Carrier Codes (GB3469-83) classifies documents into 26 categories according to practical standards, namely: monographs, newspapers, periodicals, conference proceedings, compilations, dissertations, scientific reports, technical standards, patent documents, product samples, Chinese translations, manuscripts, reference tools, retrieval tools, files, charts, ancient books and so on.
Extended data
The type of recommendation letter is marked as follows:
1. Types of references: monographs [M], essays [C], newspaper articles [N], journal articles [J], dissertations [D], reports [R], standards [S], patents [P], and precipitated documents [A] in theses.
2. Types of electronic documents: database [DB], computer [CP] and electronic bulletin [EB].
3. Carrier types of electronic documents: Internet [OL], compact disc [CD], magnetic tape [MT] and magnetic disk [DK].
Baidu Encyclopedia-Literature Information Resources
Baidu Encyclopedia-References