To cite the 'pcIRT' package in publications use:

Christine Hohensinn (2016). pcIRT: IRT models for polytomous and continuous item responses. R package version 0.2.2.

Corresponding BibTeX entry:

  @Manual{,
    title = {pcIRT: IRT models for polytomous and continuous item
      responses},
    author = {Christine Hohensinn},
    year = {2016},
    note = {R package version 0.2.2},
  }