To cite package ‘nzelect’ in publications use:

  Ellis P (2017). _nzelect: New Zealand Election Data_. R package
  version 0.4.0, <https://CRAN.R-project.org/package=nzelect>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {nzelect: New Zealand Election Data},
    author = {Peter Ellis},
    year = {2017},
    note = {R package version 0.4.0},
    url = {https://CRAN.R-project.org/package=nzelect},
  }