1. Insomnia and Its Treatment
2. Walsh JK, Engelhardt CL, Hartman PG: The direct economic cost of insomnia; in Nutt D, Mendelson W (eds): Hypnotics and Anxiolytics: Bailliere's Clinical Psychiatry. London, Bailliere Tindall, 1995, pp 369-381.
3. Management of Insomnia