"The International Classification of Sleep Disorders, Revised: Diagnostic and Coding Manual". 2001 edition, ISBN0-9657220-1-5, PDF-complete, Library of Congress Catalog No. 97-71405. "Archived copy"(PDF). Archived from the original(PDF) on 2011-07-26. Retrieved 2011-07-26.{{cite web}}: CS1 maint: archived copy as title (link).
"The International Classification of Sleep Disorders, Revised: Diagnostic and Coding Manual". 2001 edition, ISBN0-9657220-1-5, PDF-complete, Library of Congress Catalog No. 97-71405. "Archived copy"(PDF). Archived from the original(PDF) on 2011-07-26. Retrieved 2011-07-26.{{cite web}}: CS1 maint: archived copy as title (link).