To cite package 'phonTools' in publications use:

Santiago Barreda (2015). phonTools: Functions for phonetics in R. R package version 0.2-2.1.

Corresponding BibTeX entry:

  @Manual{,
    title = {phonTools: Functions for phonetics in R.},
    author = {Santiago Barreda},
    year = {2015},
    note = {R package version 0.2-2.1},
  }