To cite crmPack in publications use:

  Sabanés Bové D, Yeung WY, Palermo G, Jaki T (2019). “Model-Based Dose
  Escalation Designs in R with crmPack.” _Journal of Statistical
  Software_, *89*(10), 1-22. doi:10.18637/jss.v089.i10
  <https://doi.org/10.18637/jss.v089.i10>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Model-Based Dose Escalation Designs in {R} with {crmPack}},
    author = {Daniel {Saban\'es Bov\'e} and Wai Yin Yeung and Giuseppe Palermo and Thomas Jaki},
    journal = {Journal of Statistical Software},
    year = {2019},
    volume = {89},
    number = {10},
    pages = {1--22},
    doi = {10.18637/jss.v089.i10},
  }