To cite package ‘cowbell’ in publications use:

Luerig C (2017). cowbell: Performs Segmented Linear Regression on Two Independent Variables. R package version 0.1.0, https://CRAN.R-project.org/package=cowbell.

Corresponding BibTeX entry:

  @Manual{,
    title = {cowbell: Performs Segmented Linear Regression on Two
      Independent Variables},
    author = {Christoph Luerig},
    year = {2017},
    note = {R package version 0.1.0},
    url = {https://CRAN.R-project.org/package=cowbell},
  }