To cite package ‘IRTM’ in publications use:

  Morucci M, Foster M, Siegel D (2026). _IRTM: Theory-Driven Item
  Response Theory (IRT) Models_. R package version 0.0.1.2,
  <https://CRAN.R-project.org/package=IRTM>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {IRTM: Theory-Driven Item Response Theory (IRT) Models},
    author = {Marco Morucci and Margaret Foster and David Siegel},
    year = {2026},
    note = {R package version 0.0.1.2},
    url = {https://CRAN.R-project.org/package=IRTM},
  }