- American Sleep Association. Delayed Sleep Phase Syndrome. Accessed 5/16/2013.
- Bjorvatn Bjø, Pallesen Sta°, A practical approach to circadian rhythm sleep disorders, Sleep Medicine Reviews (2008), doi:10.1016/j.smrv.2008.04.009. www.cmse.ch. Accessed 5/16/2013.
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This document was last reviewed on: 05/15/2013