APA (7th ed.) Citation

Reidun Ursin, Fred Holsten, & Bjørn Bjorvatn. Sleep in 40-45-year-olds in Hordaland county, Norway. Norsk Forening for Epidemiologi.

Chicago Style (17th ed.) Citation

Reidun Ursin, Fred Holsten, and Bjørn Bjorvatn. Sleep in 40-45-year-olds in Hordaland County, Norway. Norsk Forening for Epidemiologi.

MLA (9th ed.) Citation

Reidun Ursin, et al. Sleep in 40-45-year-olds in Hordaland County, Norway. Norsk Forening for Epidemiologi.