Nadya
http://www.nadya-senpe.com/
National Policy and Resource Center on Nutrition and Aging
http://nutritionandaging.fiu.edu/
Organización Mundial de la Salud
http://www.who.int/en/
UN Progamme on Aging
http://www.un.org/esa/socdev/ageing/index.html
La Biblioteca Cochrane Plus
http://www.update-software.com/clibplus/clibplus.asp
BestBets (Best Evidence Topics)
http://www.bestbets.org/
Centre for Evidence-Based Medicine
http://www.cebm.net/
Centre for Reviews and Dissemination
http://www.york.ac.uk/inst/crd/
Guías de Práctica Clínica en el Sistema Nacional de Salud
http://www.guiasalud.es/home.asp
National Guideline Clearinghouse
http://www.guidelines.gov/
National Institute for Health and Clinical Excellence (NICE)
http://www.nice.org.uk/
National Library of Guidelines Specialist Library
http://www.library.nhs.uk/guidelinesFinder/Default.aspx?pagename=HOME
New Zealand Guidelines Group
http://www.nzgg.org.nz/index.cfm?
Scottish Intercollegiate Guideline Network
http://www.sign.ac.uk/
Trip Database Plus
http://www.tripdatabase.com/index.html