To cite package ‘internetarchive’ in publications use:

  Mullen L (2016). _internetarchive: An API Client for the Internet
  Archive_. R package version 0.1.6, ,
  <https://github.com/ropensci/internetarchive>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {internetarchive: An API Client for the Internet Archive},
    author = {Lincoln Mullen},
    year = {2016},
    note = {R package version 0.1.6, 
},
    url = {https://github.com/ropensci/internetarchive},
  }