To cite package ‘MetaStan’ in publications use:

  Guenhan B, Roever C (2022). _MetaStan: Bayesian Meta-Analysis via
  'Stan'_. R package version 1.0.0,
  <https://CRAN.R-project.org/package=MetaStan>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {MetaStan: Bayesian Meta-Analysis via 'Stan'},
    author = {Burak Kuersad Guenhan and Christian Roever},
    year = {2022},
    note = {R package version 1.0.0},
    url = {https://CRAN.R-project.org/package=MetaStan},
  }