To cite RRreg in publications use:

Heck DW, Moshagen M (2018). “RRreg: An R Package for Correlation and Regression Analyses of Randomized Response Data.” Journal of Statistical Software, 85(2), 1–29. doi:10.18637/jss.v085.i02.

Corresponding BibTeX entry:

  @Article{,
    title = {{RRreg}: An {R} Package for Correlation and Regression
      Analyses of Randomized Response Data},
    author = {Daniel W. Heck and Morten Moshagen},
    journal = {Journal of Statistical Software},
    year = {2018},
    volume = {85},
    number = {2},
    pages = {1--29},
    doi = {10.18637/jss.v085.i02},
  }