To cite mFD in publications use:

  Magneville C, Loiseau N, Albouy C, Casajus N, Claverie T, Escalas A,
  Leprieur F, Maire E, Mouillot D, Villeger S (2022). _mFD: mFD: an R
  package to compute and illustrate the multiple facets of functional
  diversity_, volume 2022 number 1.
  <https://onlinelibrary.wiley.com/doi/full/10.1111/ecog.05904>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {{mFD}: mFD: an R package to compute and illustrate the multiple 
  facets of functional diversity},
    author = {Camille Magneville and Nicolas Loiseau and Camille Albouy and Nicolas Casajus and Thomas Claverie and Arthur Escalas and Fabien Leprieur and Eva Maire and David Mouillot and Sebastien Villeger},
    journal = {Ecography},
    year = {2022},
    volume = {2022},
    number = {1},
    pages = {1--15},
    url = {https://onlinelibrary.wiley.com/doi/full/10.1111/ecog.05904},
  }