Citation can be divided into explicit citation and implicit citation. Explicit quotation refers to quoting the original text directly with quotation marks, or only quoting the main idea of the original text without quotation marks, but indicating the source of the original text. Dark quotation refers to weaving the quotation into your own words, without explaining the source of the quotation, without quoting the original sentence, or only quoting the general idea.

Extended data:

Role of reference:

Citation, also known as reference, refers to the description of relevant documents and materials cited or referenced for writing or editing works, usually attached to the chapters of papers and books, and sometimes appears in the text in the form of notes (footnotes). Citation is an important part of academic works, which embodies the inheritance and development relationship between documents.

Citation has duality, namely objectivity and subjectivity. Citation objectively reflects the track of academic development, and it is the trace left by the transmission and utilization of information and knowledge. Subjectively, quotation is the product of the author's personal views, attitudes, prejudices or hobbies. This quotation activity is also a complex intellectual activity, and the author's subjective thought determines the practice of quotation.

In a sense, the academic and authoritative nature of the paper can also be shown from the references to a certain extent. Any research achievements in the history of science are created on the basis of the labor achievements of predecessors or others, and can be passed down from generation to generation through mutual reference among scholars.

The functions of citation are as follows: it can reflect the author's scientific attitude and the true and extensive scientific basis of the paper, as well as the starting point and depth of the paper; It can easily distinguish the author's achievements from those of his predecessors; It can play an index role and provide clues for finding papers; It is helpful for scientific and technological information personnel to carry out information research and bibliometrics research.