Please cite 'NatureSounds' as follows:

Araya-Salas M (2018). NatureSounds: a collection of animal sound for bioacoustic analysis in the R environment.

Corresponding BibTeX entry:

  @Manual{,
    title = {NatureSounds: a collection of animal sound for bioacoustic
      analysis in the R environment},
    author = {M. Araya-Salas},
    year = {2018},
  }