To carry out scientific work, you must establish your bibliography, that is to say, draw up a list of documents useful for research on a given subject. In a context of overabundance of information and diversity of its supports, the processes of bibliographic research and validation of information, the application of a logical and effective methodology.  Bibliographic research is a methodological approach made up of steps allowing you to search, identify, retrieve and process documents and information on a given subject. Documenting yourself means knowing where and how to find information, knowing how to ask the right questions, knowing what information you need, knowing how to read it, understand it, criticize it and evaluate it. The document can be a book, a periodical article, an audio or audiovisual document. The document, a vehicle of information, is found in different media.