To cite the package or source paper in publications use:

  Kempenaers B, Valcu M (2017). Breeding site sampling across the
  Arctic by individual males of a polygynous shorebird. Nature, 541,
  528-531. doi: 10.1038/nature20813.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Breeding site sampling across the Arctic by individual males of a polygynous shorebird},
    author = {Bart Kempenaers and Mihai Valcu},
    journal = {Nature},
    year = {2017},
    volume = {541},
    pages = {528--531},
    doi = {10.1038/nature20813},
    url = {https://doi.org/10.1038/nature20813},
  }