According to national standards, references should be quoted in a certain format, and different types of references should be distinguished, that is, letters should be used. Common types of letters of recommendation are:
1, monograph [M], collection of essays [C], newspaper articles [N], journal articles [J], dissertations [D], reports [R], standards [S], patents [P], and documents deposited in papers [a];
2. Electronic file types: database [DB], computer [CP], electronic bulletin [EB];
3. Carrier types of electronic documents: Internet [OL], compact disc [CD], magnetic tape [MT] and magnetic disk [DK].
Extended data
Examples of different types of reference formats:
1, monograph type: [1] Liu Guojun, Chen Shaoye, Wang Fengzhu. Library catalogue [M]. Beijing: Higher Education Press, 1957+05- 18.
2. Journal type: [7] Jin Xianhe, Wang Changchang, Wang Zhongdong, et al. A digital filtering technology for on-line detection of partial discharge [J]. Journal of Tsinghua University (Natural Science Edition),1993,33 (4): 62-67.
3. Sedimentary literature type: [9] Zhong Wenfa. The Application of Nonlinear Programming in the Distribution of Combustible Poisons [A]. Zhao Wei. Theory and Application of Operations Research-Proceedings of the Fifth Congress of China Logistics Society [C]. Xi 'an: xidian university Publishing House, 1996. 468-47 1.
4. Newspaper type: [1 1] Xie Xide. Create new learning ideas. People's Daily, 1998- 12-25⑽.
Baidu Encyclopedia-References