To cite the 'STARTS' package in publications use:

Robitzsch, A., & Luedtke, O. (2018). STARTS: Functions for the STARTS model. R package version 1.1-6. https://CRAN.R-project.org/package=STARTS

Corresponding BibTeX entry:

  @Manual{,
    title = {{STARTS: Functions for the STARTS model}},
    author = {Alexander Robitzsch and Oliver Luedtke},
    year = {2018},
    note = {R package version 1.1-6},
    url = {https://CRAN.R-project.org/package=STARTS},
  }