To cite metaBMA in publications use:

Heck, D. W., Gronau, Q. F., & Wagenmakers, E.-J. (2019). metaBMA: Bayesian Model Averaging for Random and Fixed Effects Meta-Analysis. https://CRAN.R-project.org/package=metaBMA

Corresponding BibTeX entry:

  @Manual{,
    title = {metaBMA: Bayesian Model Averaging for Random and Fixed
      Effects Meta-Analysis},
    author = {{Heck} and D. W. and {Gronau} and Q. F. and & Wagenmakers
      and {E.-J.}},
    year = {2019},
    url = {https://CRAN.R-project.org/package=metaBMA},
  }