This work brings together the concepts of documentary languages​​, linguistic systems that allow the organization of knowledge. The seven chapters that make dealing with the study of the nature and application of different types of languages ​​-lists subject headings, classification systems and tesauros- in analysis tasks and information retrieval. To facilitate the study of these issues, the manual and references, including self-assessment questionnaires, with solutions, and a broad glosario.El book is intended for readers interested in documentary techniques and, in particular, both opponents as students from schools and colleges of library and information science.