The reasons for this secular subsistence are the following2: Only the printed page accompanied by illustrations is truly effective when the information is extremely complex. The use of the book does not depend on any auxiliary or reproductive equipment. Reading as a process of assimilation of information occurs faster than listening. However, among the most important inconveniences related to the transmission of knowledge through books, it is possible to cite the long delay between the preparation of the original and its publication. From the formal point of view, books3 are documents with more than 48 pages that constitute a bibliographic unit. By their content, books have a scientific, practical or literary character; they cover all the cultural manifestations of man. The book is the publication of a text or graphic representations greater than 48 (the cover and title page are excluded). It can consist of one volume or several, numbered or edited as part of a collection or series. According to Mikhailov, Chiornii and Guilariesvskii4, the generalizations of scientific knowledge that characterize books give them great importance, since they facilitate the investigation of the cardinal problems of any field of knowledge and constitute an incomparable means of education, teaching and culture. Books belong to the set of monographic publications and can also be included within traditional documents. In this context, monographic publications3 are defined as those that contain text, illustrations or both, in a directly readable form and are presented in full in a single volume or must be completed in a finite number of volumes (Reference adapted from ISBD (M)).
In general, they are called books. This class of documents also includes brochures, textbooks, manuals, monographs, theses, reports and reports whose definitions appear in Annex 1. The Latin American and Caribbean Information System in Health Sciences establishes a division of the documents different for the materials processed by LILACS5, however, it does not contradict in any way with that of this manual. Such categorization is the following: monographs, theses, dissertations, unconventional documents and conferences. It is necessary to clarify that although unconventional theses, dissertations and documents conform to the definition of monographs, they are part of a subset of them: in this case, manuscripts. Regarding reports and memories, their membership in periodical publications is established if their frequency is fixed.