Habib, Michel (2004). "Athymhormia and Disorders of Motivation in Basal Ganglia Disease". The Journal of Neuropsychiatry and Clinical Neurosciences. 16 (4). American Psychiatric Association Publishing: 509–524. doi:10.1176/jnp.16.4.509. ISSN0895-0172.
Habib, Michel (2004). "Athymhormia and Disorders of Motivation in Basal Ganglia Disease". The Journal of Neuropsychiatry and Clinical Neurosciences. 16 (4). American Psychiatric Association Publishing: 509–524. doi:10.1176/jnp.16.4.509. ISSN0895-0172.