To cite IsoplotR in publications, please use

  Vermeesch, Pieter (2018). IsoplotR: a free and open toolbox for
  geochronology. Geoscience Frontiers, 9, 1479-1493. URL
  https://doi.org/10.1016/j.gsf.2018.04.001

A BibTeX entry for LaTeX users is

  @Article{,
    author = {Pieter Vermeesch},
    title = {{IsoplotR}: a free and open toolbox for geochronology},
    journal = {Geoscience Frontiers},
    year = {2018},
    volume = {9},
    pages = {1479-1493},
    url = {https://doi.org/10.1016/j.gsf.2018.04.001},
  }