Castro, E., M. T. Sportiello, and D. M. Cammisuli. “Neuropsychological Features of Mild Cognitive Impairment in Parkinson’s Disease: A Critical Review of the Literature”. Journal of Aging and Gerontology, vol. 2, no. 2, July 2014, pp. 100-14, doi:10.12974/2309-6128.2014.02.02.5.