To cite the package 'IRTBEMM' in publications use:

Guo S, Zheng C, Kern JL (2020). “IRTBEMM: An R Package for Estimating IRT Models With Guessing or Slipping Parameters.” Applied Psychological Measurement, 44(7-8), 566–567. doi:10.1177/0146621620932654, http://dx.doi.org/10.1177/0146621620932654.

Guo S, Zheng C, Kern JL (2019). IRTBEMM: Family of Bayesian EMM Algorithm for Item Response Models.

Corresponding BibTeX entries:

  @Article{,
    title = {IRTBEMM: An R Package for Estimating IRT Models With
      Guessing or Slipping Parameters},
    author = {Shaoyang Guo and Chanjin Zheng and Justin L. Kern},
    journal = {Applied Psychological Measurement},
    year = {2020},
    volume = {44},
    number = {7-8},
    pages = {566–567},
    doi = {10.1177/0146621620932654},
    url = {http://dx.doi.org/10.1177/0146621620932654},
  }

  @Manual{,
    title = {{IRTBEMM: Family of Bayesian EMM Algorithm for Item
      Response Models}},
    author = {Shaoyang Guo and Chanjin Zheng and Justin L Kern},
    year = {2019},
  }