To cite package 'captr' in publications use:

Gaurav Sood (2017). captr: R Client to Captricity API. R package version 0.3.0.

Corresponding BibTeX entry:

  @Manual{,
    title = {captr: R Client to Captricity API},
    author = {Gaurav SOod},
    year = {2017},
    note = {R package version 0.3.0},
  }