To cite package ‘rdfp’ in publications use:

  Mortimer SM (2019). _rdfp: An Implementation of the 'DoubleClick for
  Publishers' API_. R package version 0.1.4.9000,
  <https://github.com/stevenmmortimer/rdfp>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {rdfp: An Implementation of the 'DoubleClick for Publishers' API},
    author = {Steven M. Mortimer},
    year = {2019},
    note = {R package version 0.1.4.9000},
    url = {https://github.com/stevenmmortimer/rdfp},
  }