To cite package ‘getCRUCLdata’ in publications use:

  Sparks AH (2017). “getCRUCLdata: Use and Explore CRU CL v. 2.0
  Climatology Elements in R.” _Journal of Open Source Software_,
  *2*(12), 230. doi:10.21105/joss.00230
  <https://doi.org/10.21105/joss.00230>,
  <https://doi.org/10.21105/joss.00230>.

A BibTeX entry for LaTeX users is

  @Article{Sparks2017,
    author = {Adam H Sparks},
    title = {{getCRUCLdata}: Use and Explore {CRU CL} v. 2.0 Climatology Elements in {R}},
    journal = {Journal of Open Source Software},
    year = {2017},
    publisher = {The Open Journal},
    volume = {2},
    number = {12},
    pages = {230},
    doi = {10.21105/joss.00230},
    url = {https://doi.org/10.21105/joss.00230},
  }