To cite redistmetrics in publications use:

Kenny C, McCartan C, Fifield B, Imai K (2023). redistmetrics: Redistricting Metrics. R package, https://alarm-redist.org/redistmetrics/.

Corresponding BibTeX entry:

  @Manual{redistmetrics,
    title = {{redistmetrics}: Redistricting Metrics},
    author = {Christopher T. Kenny and Cory McCartan and Ben Fifield
      and Kosuke Imai},
    year = {2023},
    note = {R package},
    url = {https://alarm-redist.org/redistmetrics/},
  }