To cite assignR in publications use:

Ma Chao, Vander Zanden Hannah B., Wunder Michael B., Bowen Gabriel J. (2020). “assignR: An R package for isotope-based geographic assignment.” Methods in Ecology and Evolution. doi:10.1111/2041-210X.13426, https://doi.org/10.1111/2041-210X.13426.

Corresponding BibTeX entry:

  @Article{,
    title = {assignR: An R package for isotope-based geographic
      assignment},
    author = {{Ma Chao} and {Vander Zanden Hannah B.} and {Wunder
      Michael B.} and {Bowen Gabriel J.}},
    journal = {Methods in Ecology and Evolution},
    year = {2020},
    doi = {10.1111/2041-210X.13426},
    url = {https://doi.org/10.1111/2041-210X.13426},
  }