To cite package ‘hillR’ in publications use:

  Li, (2018). hillR: taxonomic, functional, and phylogenetic diversity
  and similarity through Hill Numbers. Journal of Open Source Software,
  3(31), 1041. https://doi.org/10.21105/joss.01041

A BibTeX entry for LaTeX users is

  @Article{,
    title = {hillR: taxonomic, functional, and phylogenetic diversity and similarity through Hill Numbers},
    author = {Daijiang Li},
    journal = {Journal of Open Source Software},
    year = {2018},
    volume = {3},
    number = {31},
    pages = {1041},
    url = {https://doi.org/10.21105/joss.01041},
  }