To cite the adephylo package:

Jombart T, Balloux F, Dray S (2010). “adephylo: new tools for investigating the phylogenetic signal in biological traits.” Bioinformatics, 26, 1907-1909. doi:10.1093/bioinformatics/btq292.

Corresponding BibTeX entry:

  @Article{,
    title = {adephylo: new tools for investigating the phylogenetic
      signal in biological traits},
    journal = {Bioinformatics},
    year = {2010},
    author = {Thibaut Jombart and François Balloux and St\'ephane
      Dray},
    volume = {26},
    pages = {1907-1909},
    doi = {10.1093/bioinformatics/btq292},
  }