To cite package ‘SSHAARP’ in publications use:

  Tran L, Mack S (2021). _SSHAARP: Searching Shared HLA Amino Acid
  Residue Prevalence_. R package version 1.1.0,
  <https://CRAN.R-project.org/package=SSHAARP>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {SSHAARP: Searching Shared HLA Amino Acid Residue Prevalence},
    author = {Livia Tran and Steven Mack},
    year = {2021},
    note = {R package version 1.1.0},
    url = {https://CRAN.R-project.org/package=SSHAARP},
  }