To cite sars in a publication:

Matthews, T.J., Triantis, K., Whittaker, R.J. and Guilhaumon, F. (2019) sars: an R package for fitting, evaluating and comparing species–area relationship models. In press.

Corresponding BibTeX entry:

  @Article{,
    title = {sars: an R package for fitting, evaluating and comparing
      species–area relationship models},
    author = {T.J. Matthews and K. Triantis and R.J. Whittaker and F.
      Guilhaumon},
    journal = {Ecography},
    volume = {In Press},
    pages = {In Press},
    year = {2019},
  }