To cite package ‘IMTest’ in publications use:

Harel D (2017). IMTest: Information Matrix Test for Generalized Partial Credit Models. R package version 1.0.0, https://CRAN.R-project.org/package=IMTest.

Corresponding BibTeX entry:

  @Manual{,
    title = {IMTest: Information Matrix Test for Generalized Partial
      Credit Models},
    author = {Daphna Harel},
    year = {2017},
    note = {R package version 1.0.0},
    url = {https://CRAN.R-project.org/package=IMTest},
  }