1. Thorpy MJ . Classification of sleep disorders. In: Principles and Practice of Sleep Medicine. Kryger MH, Roth T, Dement WC. (Eds). Saunders, PA, USA , 615 – 625 (2005)
2. Emerging research on the treatment and etiology of secondary or comorbid insomnia
3. Edinger J , Bootzin R , Buysse D . Insomnia. In: International Classification of Sleep Disorders: Diagnostic and Coding Manual. Thorpy MJ. (Ed.). American Academy of Sleep Medicine, IL, USA , 1 – 31 (2005) .
4. Edinger JD , Means MK . Overview of insomnia: definitions, epidemiology, differential diagnosis, and assessment. In: Principles and Practice of Sleep Medicine. Kryger MH, Roth T, Dement WC (Eds). Elsevier Saunders, PA, USA , 702 – 713 (2005) .