Fonte positiva dos dados

Autor de: Ressonância magnética do cérebro e da coluna vertebral... c2008: (p.r.: M.D., professor de Radiologia, Stanford University School of Medicine)

http://authorities.loc.gov 17/9/09: (d.n.)

http://catalogue.bl.uk 1/9/09: (d.n.)

http://www.hoover.org/bios/atlas.html