World Health Organisation. (1992). ICD-10 Classifications of Mental and Behavioural Disorder: Clinical Descriptions and Diagnostic Guidelines. Geneva. World Health Organisation.
A reference is basically a connection to a source of information or data, a term or location that identifies where to go or where to look. A reference can also be an allusion or mention of a specific...
Professional references are listed first, followed by personal references if required. Usually the "strongest" reference is listed first, ie. the person who has the most knowledge of your work...