To cite package `Sojourn` in publications use:

Paul R. Hibbing, Kate Lyden, & Isaac J. Schwabacher (2019). Sojourn: Apply Sojourn methods for processing ActiGraph accelerometer data. URL: https://cran.r-project.org/package=Sojourn.

Corresponding BibTeX entry:

  @Misc{,
    title = {Sojourn: Apply Sojourn methods for processing ActiGraph
      accelerometer data},
    author = {Paul R. Hibbing and Kate Lyden and Isaac J. Schwabacher},
    year = {2019},
    url = {https://cran.r-project.org/package=Sojourn},
  }