To cite the 'TAM' package in publications use:

Robitzsch A, Kiefer T, Wu M (2020). TAM: Test Analysis Modules. R package version 3.4-26, https://CRAN.R-project.org/package=TAM.

Corresponding BibTeX entry:

  @Manual{TAM_3.4-26,
    title = {TAM: Test Analysis Modules},
    author = {Alexander Robitzsch and Thomas Kiefer and Margaret Wu},
    year = {2020},
    note = {R package version 3.4-26},
    url = {https://CRAN.R-project.org/package=TAM},
  }