American Urological Association ( www.auanet.org)
American Foundation for Urologic Disease ( www.afud.org)
American Endourology Society ( www.endourology.org)
American Medical Association ( www.ama-assn.org)
Kidney Stones Handbook ( www.kidneystonesbook.net)
National Library of Medicine ( www.nlm.nih.gov)
American Association of Kidney Patients (www.aakp.org)