To cite OptimalCutpoints in publications use:

Monica Lopez-Raton, Maria Xose Rodriguez-Alvarez, Carmen Cadarso Suarez, Francisco Gude Sampedro (2014). OptimalCutpoints: An R Package for Selecting Optimal Cutpoints in Diagnostic Tests. Journal of Statistical Software, 61(8), 1-36. URL http://www.jstatsoft.org/v61/i08/.

Corresponding BibTeX entry:

  @Article{,
    title = {{OptimalCutpoints}: An {R} Package for Selecting Optimal
      Cutpoints in Diagnostic Tests},
    author = {M{\'o}nica L{\'o}pez-Rat{\'o}n and Mar{\'i}a Xos{\'e}
      Rodr{\'i}guez-{\'A}lvarez and Carmen Cadarso Su{\'a}rez and
      Francisco Gude Sampedro},
    journal = {Journal of Statistical Software},
    year = {2014},
    volume = {61},
    number = {8},
    pages = {1--36},
    url = {http://www.jstatsoft.org/v61/i08/},
  }