To cite package ‘posteriordb’ in publications use:

  Magnusson M, Bürkner P, Vehtari A (2023). _posteriordb: R
  functionality for posteriordb_. R package version 0.3.2,
  <https://github.com/stan-dev/posteriordb-r>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {posteriordb: R functionality for posteriordb},
    author = {Mans Magnusson and Paul-Christian Bürkner and Aki Vehtari},
    year = {2023},
    note = {R package version 0.3.2},
    url = {https://github.com/stan-dev/posteriordb-r},
  }