To cite 'isotracer' in publications, you can use the references below
(the first one is the original methodological paper, the second one is
the paper introducing the package implementation):

  López-Sepulcre A, Bruneaux M, Collins SM, El-Sabaawi R, Flecker AS,
  Thomas SA (2020). “A new method to reconstruct quantitative food webs
  and nutrient flows from isotope tracer addition experiments.” _The
  American Naturalist_, *195*(6), 964-985. doi:10.1086/708546
  <https://doi.org/10.1086/708546>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {A new method to reconstruct quantitative food webs and nutrient flows from isotope tracer addition experiments},
    volume = {195},
    doi = {10.1086/708546},
    number = {6},
    journal = {The American Naturalist},
    author = {Andrés López-Sepulcre and Matthieu Bruneaux and Sarah M. Collins and Rana El-Sabaawi and Alexander S. Flecker and Steven A. Thomas},
    year = {2020},
    pages = {964--985},
  }

  Bruneaux M, López-Sepulcre A (2022). “isotracer: An R package for the
  analysis of tracer addition experiments.” _Methods in Ecology and
  Evolution_, *13*(5), 1119-1134. doi:10.1111/2041-210X.13822
  <https://doi.org/10.1111/2041-210X.13822>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {isotracer: An R package for the analysis of tracer addition experiments},
    volume = {13},
    doi = {10.1111/2041-210X.13822},
    number = {5},
    journal = {Methods in Ecology and Evolution},
    author = {Matthieu Bruneaux and Andrés López-Sepulcre},
    year = {2022},
    pages = {1119--1134},
  }