To cite hopit in publications use:

Dańko M. J., (2019). hopit: An R Package for Analysis of Reporting Behavior Using Generalized Ordered Probit Models. Journal of Open Source Software, 4(43), 1508, https://doi.org/10.21105/joss.01508

Corresponding BibTeX entry:

  @Article{,
    title = {{hopit}: An {R} package for Analysis of Reporting Behavior
      Using Generalized Ordered Probit Models},
    author = {Maciej J. Danko},
    journal = {Journal of Open Source Software},
    year = {2019},
    volume = {4},
    number = {43},
    pages = {1508},
    doi = {10.21105/joss.01508},
  }