Barroso Espadero D, Orejón de Luna G, Fernández Rodríguez MM. Introduction to MEDLINE and to the bibliographic searches (II). PubMed users guide. Rev Pediatr Aten Primaria. 2004;6:77-112.

Barroso Espadero D, Fernández Rodríguez MM, Orejón de Luna G. Introduction to MEDLINE and to the bibliographic searches (I). Bases on medical bibliography and searches. MEDLINE in Internet. PubMed and family. Rev Pediatr Aten Primaria. 2003;5:603-628.

Buñuel Álvarez JC, González Rodríguez P. Bibliografic research through internet. The way to find the best evidence existing: database of evidence based Medicine. Rev Pediatr Aten Primaria. 2003;5:109-132.