To cite the FD package in publications please use:

  Laliberté, E., and P. Legendre (2010) A distance-based framework for
  measuring functional diversity from multiple traits. Ecology
  91:299-305.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {A distance-based framework for measuring functional diversity from multiple traits},
    author = {Etienne Laliberté and Pierre Legendre},
    journal = {Ecology},
    year = {2010},
    volume = {91},
    pages = {299--305},
  }

  Laliberté, E., Legendre, P., and B. Shipley. (2026). FD: measuring
  functional diversity from multiple traits, and other tools for
  functional ecology. R package version 1.0-12.6.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {FD: measuring functional diversity from multiple traits, and other tools for functional ecology},
    author = {Etienne Laliberté and Pierre Legendre and Bill Shipley},
    year = {2026},
    note = {R package version 1.0-12.6},
  }

See http://www.elaliberte.info/publications for a PDF version of the
article.