The process of knowledge along with technical and scientific progress is continually complicated. Also, the instrumentation that we use the same is necessary to perfect. It must be appropriate to the situations created. The purpose of the paper is to highlight the different types of arguments of authority and to analyze their use in the contemporary knowledge process. The applied knowledge methods are very different. Method of analysis, method of synthesis, non-strict analogy, incomplete induction, systemic method, synergetic method. The significance of this article is to analyze the types of arguments used frequently and which have a greater impact in a speech and in particular in the political discourse. Among the types of arguments used are arguments based on authority. Some aspects of this type of argumentation are highlighted as: their universality, the persistence of model imperatives and a greater weight in political discourse. The main types of possible authorities to be invoked are also analyzed. The first type of authority in this classification is the person's authority. But the person invoked as authority may be different. The supreme model of the person's authority is, of course, divinity. The second type of authority, as an argument, belongs to the notion expressed by the authority of value. Here the value as argument of authority is considered from several points of view: the first is that the value is fixed over time, the second is that value is the result of general consensus, the third is that value is the result of the experience of generations that have established its favorable utility for the community, for the domain. The third type of authority is the authority of the law. In this framework two main characteristics are analyzed: the first existence of the social body is related to the domination of the law, the second, the dynamics of the society is related to the action of the law. These three types of authorities and form the whole of the argument based on authority. The arguments have been defined and exemplified: the authority's argument with its variants, the argument of the person and the argument of value.