To cite tuneR in publications use:

Ligges, Uwe (2011). tuneR: Analysis of music. URL: http://r-forge.r-project.org/projects/tuner/.

Corresponding BibTeX entry:

  @Manual{,
    title = {{tuneR}: Analysis of music},
    author = {Uwe Ligges},
    year = {2011},
    url = {http://r-forge.r-project.org/projects/tuner/},
  }