To cite package ‘isoreader2’ in publications use:

  Kopf, Sebastian, Davidheiser-Kroll, Brett, Kocken, Ilja (2021).
  “Isoreader: An R package to read stable isotope data files for
  reproducible research.” _Journal of Open Source Software_, *6*(61),
  2878. doi:10.21105/joss.02878 <https://doi.org/10.21105/joss.02878>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Isoreader: An R package to read stable isotope data files for reproducible research},
    author = {{Kopf} and {Sebastian} and {Davidheiser-Kroll} and {Brett} and {Kocken} and {Ilja}},
    journal = {Journal of Open Source Software},
    year = {2021},
    volume = {6},
    number = {61},
    pages = {2878},
    doi = {10.21105/joss.02878},
  }