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To cite the 'PP' package in publications use:

Reif M, Steinfeld J (2021). PP: Estimation of person parameters for the 1,2,3,4-PL model and the GPCM.. R package version 0.6.3-11, https://github.com/jansteinfeld/PP.

Corresponding BibTeX entry: 

  @Manual{,
    title = {PP: Estimation of person parameters for the 1,2,3,4-PL
      model and the GPCM.},
    author = {Manuel Reif and Jan Steinfeld},
    year = {2021},
    note = {R package version 0.6.3-11},
    url = {https://github.com/jansteinfeld/PP},
  }

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.