To cite CDM in publications use:

Ann Cathrice George, Alexander Robitzsch, Thomas Kiefer, Juergen Gross, Ali Uenlue (2016). The R Package CDM for Cognitive Diagnosis Models. Journal of Statistical Software, 74(2), 1-24.<doi:10.18637/jss.v074.i02>

Corresponding BibTeX entry:

    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},