To cite package ‘metabook’ in publications use:

  Schwarzer G (2026). _metabook: Data Sets and Code for "Meta-Analysis
  with R"_. R package version 0.3-0,
  <https://github.com/guido-s/metabook>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {metabook: Data Sets and Code for "Meta-Analysis with R"},
    author = {Guido Schwarzer},
    year = {2026},
    note = {R package version 0.3-0},
    url = {https://github.com/guido-s/metabook},
  }