To cite package ‘needs’ in publications use:

Katz J (2016). needs: Attaches and Installs Packages. R package version 0.0.3, https://github.com/joshkatz/needs.

Corresponding BibTeX entry:

  @Manual{,
    title = {needs: Attaches and Installs Packages},
    author = {Josh Katz},
    year = {2016},
    note = {R package version 0.0.3},
    url = {https://github.com/joshkatz/needs},
  }