How biological clocks work - National Institute of Mental Health (U.S.) ([Bethesda, Md. : National Institute of Mental Health, 2001)
Title from title screen (viewed on July 7, 2003).
"January 2001."
System requirements: Adobe Acrobat Reader.
Mode of access: Internet from the NIMH web site. Address as of 7/7/03: http://www.nimh.nih.gov/publicat/bioclock.pdf; current access is available via PURL.
Keywords: Biological rhythms; Circadian rhythms