1. Response to Inquiries about Journal Selection for Indexing at NLM [citado el 18 May 2004]. Disponible en: http://www.nlm.nih.gov/pubs/factsheets/j_sel_faq.html
2. Journal Selection for Index Medicus/MEDLINE® [citado el 18 May 2004]. Disponible en: http://www.nlm.nih.gov/pubs/factsheets/jsel.html