To cite 'rdefra' in publications, please use:

  Vitolo, C., Russell, A., & Tucker, A. (2016, August). Rdefra:
  interact with the UK AIR pollution database from DEFRA. The Journal
  of Open Source Software, 1(4). doi:10.21105/joss.00051

A BibTeX entry for LaTeX users is

  @Article{,
    doi = {10.21105/joss.00051},
    url = {http://dx.doi.org/10.21105/joss.00051},
    year = {2016},
    month = {08},
    publisher = {The Open Journal},
    volume = {1},
    number = {4},
    author = {{Vitolo} and {Claudia} and {Russell} and {Andrew} and {Tucker} and {Allan}},
    title = {rdefra: Interact with the {UK} {AIR} Pollution Database from {DEFRA}},
    journal = {The Journal of Open Source Software},
  }