To cite netmeta in publications use:

  Balduzzi S, Rücker G, Nikolakopoulou A, Papakonstantinou T, Salanti
  G, Efthimiou O, Schwarzer G (2023). “netmeta: An R Package for
  Network Meta-Analysis Using Frequentist Methods.” _Journal of
  Statistical Software_, *106*(2), 1-40. doi:10.18637/jss.v106.i02
  <https://doi.org/10.18637/jss.v106.i02>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{netmeta}: An {R} Package for Network Meta-Analysis Using Frequentist Methods},
    author = {Sara Balduzzi and Gerta R\"ucker and Adriani Nikolakopoulou and Theodoros Papakonstantinou and Georgia Salanti and Orestis Efthimiou and Guido Schwarzer},
    journal = {Journal of Statistical Software},
    year = {2023},
    volume = {106},
    number = {2},
    pages = {1--40},
    doi = {10.18637/jss.v106.i02},
  }