To cite the 'CDM' package in publications use:

George, A. C., Robitzsch, A., Kiefer, T., Gross, J., & Uenlue, A. (2016). The R Package CDM for cognitive diagnosis models. Journal of Statistical Software, 74(2), 1-24.<doi:10.18637/jss.v074.i02>

Robitzsch, A., Kiefer, T., George, A. C., & Uenlue, A. (2017). CDM: Cognitive diagnosis modeling. R package version 5.9-27. https://CRAN.R-project.org/package=CDM

Corresponding BibTeX entries:

  @Article{,
    title = {The {R} Package {CDM} for Cognitive Diagnosis Models},
    author = {Ann Cathrice George and Alexander Robitzsch and Thomas
      Kiefer and J{\"u}rgen Gro{\ss} and Ali {\"U}nl{\"u}},
    journal = {Journal of Statistical Software},
    year = {2016},
    volume = {74},
    number = {2},
    pages = {1--24},
    doi = {10.18637/jss.v074.i02},
  }
  @Manual{,
    title = {CDM: Cognitive diagnosis modeling},
    author = {Alexander Robitzsch and Thomas Kiefer and Ann Cathrice
      George and Ali {\"U}nl{\"u}},
    year = {2017},
    note = {R package version 5.9-27},
    url = {https://CRAN.R-project.org/package=CDM},
  }