To cite package ‘MendelianRandomization’ in publications use:

  Burgess S, Yavorska O (2024). _MendelianRandomization: Mendelian
  Randomization Package_. R package version 0.10.0,
  <https://CRAN.R-project.org/package=MendelianRandomization>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {MendelianRandomization: Mendelian Randomization Package},
    author = {Stephen Burgess and Olena Yavorska},
    year = {2024},
    note = {R package version 0.10.0},
    url = {https://CRAN.R-project.org/package=MendelianRandomization},
  }