To cite metapack in publications, use:

Lim D, Chen M, Kim S, Ibrahim JG (2020). metapack: R package for Bayesian Meta-Analysis and Network Meta-Analysis. http://merlot.stat.uconn.edu/packages/metapack/.

Corresponding BibTeX entry:

  @Manual{metapack-package,
    title = {{metapack}: {R} package for Bayesian Meta-Analysis and
      Network Meta-Analysis},
    author = {Daeyoung Lim and Ming-Hui Chen and Sungduk Kim and Joseph
      G. Ibrahim},
    year = {2020},
    url = {http://merlot.stat.uconn.edu/packages/metapack/},
  }