This research is titled Anàlisi dels gabinets de comunicació com a font informativa de la secció de Cultura de la premsa d’informació general i de les agències de notícies. Crítica i proposta d’una nova tipologia de fonts (“Analysis of communication offices as a source of information Culture section of the press of general information and news agencies. Criticism and proposed a new typology of sources”). The thesis shows the interaction between the press offices and media professionals and shows that, in the case of Spain, the contents of the Culture section of newspapers and news agencies comes from communication offices. The research studied the types of sources described by Borrat, Echevarría, López, Valbuena, Colombo, Blanco Leal, Martinez-Fresneda, Strentz and Ulibarri. Also has taken into account the contribution of authors who have established specific types of sources in cultural journalism (Esteve Ramírez & Fernández del Moral; Rodríguez Pastoriza) and other researchers who have established classifications sources specialized in Journalism, which includes cultural journalism (Quesada; Chimeno; Berganza, Castellanos). Finally, we analyzed the contribution on types of sources of investigative journalism applied to cultural Journalism (Caminos Marcet) and the contribution of Palau (2002) on types of communications offices. The analysis of the research has had a first phase of quantitative research in the Culture sections of "El País" and "La Vanguardia" and develops a qualitative analysis through a non-participant observation in "La Vanguardia" and a series of interviews with professionals working in the field of Culture in Spain, both journalists of newspapers and news agencies and press offices of institutions and companies.