Etymologically, the word bibliography comes from the Greek “biblion” which means “book” and “graphein” which means “to write”. Its definition can be understood in two ways: the first is related to the list of a group of texts, used as consultation tools when preparing a written work or research. In this case, the bibliography concentrates the most interesting publications, which are related to the topic to be investigated, it represents an important element when starting an investigation.

The bibliographies provide validity to the scientific, academic, and monographic research works, since they indicate the author’s concern to look for sources that could support the bases of his research, in the same way it serves as an orientation and adds value. The bibliographies are generally located at the end of the book, their purpose is to show the documentary support that the investigation had, in this way the readers will be able to observe the repertoire of texts consulted by the writer, and that could serve as a reference for the analysis of a special topic.

On the other hand, the term bibliography is used to define the science dedicated to the analysis of the description and orderly classification of books and other written materials. There are different types of bibliography, all are focused on the same element of research that can be a book, records, movies, etc. The bibliography is divided into:

Analytical bibliography, is the one that details the documents as bibliographic units, among them are: the descriptive one, in charge of knowing exhaustively the techniques and materials used in the publication of certain material. The historical, is responsible for the study of the origins of the book, its first publications, etc. and the textual one, is the one that applies the principles of analytical bibliography for the interpretation and modification of a text.

Enumerative or systematic bibliography, its purpose is to gather information about individual texts or other graphic materials, within a logical and appropriate order, books are not seen as physical objects but as intellectual entities. These bibliographies are in turn classified into: author bibliographies; bibliographic catalogues, guides to literature, thematic, national, selective bibliography and universal bibliography.