To cite the 'TAM' package in publications use:

Kiefer, T., Robitzsch, A. & Wu, M. (2017). TAM: Test analysis modules. R package version 1.99993-0. https://CRAN.R-project.org/package=TAM

Corresponding BibTeX entry:

  @Manual{,
    title = {TAM: Test Analysis Modules},
    author = {Thomas Kiefer and Alexander Robitzsch and Margaret Wu},
    year = {2017},
    note = {R package version 1.99993-0},
    url = {https://CRAN.R-project.org/package=TAM},
  }