The study of reference citations in scientific literature is of great importance because it gives indications of the sources referred to and relied upon in these writings. Analyzing the bibliographic references, the nature of the product of an important branch of human knowledge is identified, and its sources are analyzed after objectively, linguistically, temporally and spatially. As the intellectual output is characterized by the capacity and magnitude of its resources and the dispersion of its sources in terms of quality, objectivity, geography and language, in addition to the widening of the circle of the beneficiaries. In order to recognize the diversity of this production in all its aspects, it is necessary to carry out the analysis of bibliographic signs aimed at shedding light on the structural characteristics of the product The researcher's intellectual thinking can be used to evaluate the productivity of the authors as well as to know the trends of the subject literature.