To cite package ‘tsiR’ in publications use:

  Becker A (2019). _tsiR: An Implementation of the TSIR Model_. R
  package version 0.4.2, <https://github.com/adbecker/tsir>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {tsiR: An Implementation of the TSIR Model},
    author = {Alexander D. Becker},
    year = {2019},
    note = {R package version 0.4.2},
    url = {https://github.com/adbecker/tsir},
  }