To cite package ‘versions’ in publications use:

  Golding N (2017). _versions: Query and Install Specific Versions of
  Packages on CRAN_. R package version 0.4,
  <https://github.com/goldingn/versions>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {versions: Query and Install Specific Versions of Packages on CRAN},
    author = {Nick Golding},
    year = {2017},
    note = {R package version 0.4},
    url = {https://github.com/goldingn/versions},
  }

ATTENTION: This citation information has been auto-generated from the
package DESCRIPTION file and may need manual editing, see
‘help("citation")’.