To cite scan in publications use:

  Wilbert, J. & Lüke, T. (2023). Scan: Single-Case Data Analyses for
  Single and Multiple Baseline Designs. (0.60) [English]. CRAN.
  https://CRAN.R-project.org/package=scan.

A BibTeX entry for LaTeX users is

  @Misc{,
    title = {Scan: Single-Case Data Analyses for Single and Multiple Baseline Designs},
    shorttitle = {scan},
    publisher = {CRAN},
    author = {Jürgen Wilbert and Timo Lüke},
    year = {2023},
    url = {https://CRAN.R-project.org/package=scan},
  }