To cite equateIRT in publications use:

Michela Battauz (2015). equateIRT: An R Package for IRT Test Equating. Journal of Statistical Software, 68(7), 1-22.<doi:10.18637/jss.v068.i07>

Corresponding BibTeX entry:

  @Article{,
    title = {{equateIRT}: An {R} Package for IRT Test Equating},
    author = {Michela Battauz},
    journal = {Journal of Statistical Software},
    year = {2015},
    volume = {68},
    number = {7},
    pages = {1--22},
    doi = {10.18637/jss.v068.i07},
  }