The end of a university study is sanctioned by a scientific work either to deposit or to defend, and among these works we have a thesis, dissertation etc.Apart from the academic work, some are animated to immortalize the events by the writings, we will note that the scientific language is different from popular language that is to say that the scientific work must be free of any plagiarism, and to avoid the latter it is necessary to know how to quote the ideas drawn from the other authors and to list the worksThe purpose of this manual is to guide the researcher, to do his research well, and to better avoid plagiarism.