To cite groc in publications use:

Martin Bilodeau, Pierre Lafaye de Micheaux, Smail Mahdi (2015). The R Package groc for Generalized Regression on Orthogonal Components. Journal of Statistical Software, 65(1), 1-29. URL https://www.jstatsoft.org/v65/i01/.

Corresponding BibTeX entry:

  @Article{,
    title = {The {R} Package {groc} for Generalized Regression on
      Orthogonal Components},
    author = {Martin Bilodeau and Pierre {Lafaye de Micheaux} and Smail
      Mahdi},
    journal = {Journal of Statistical Software},
    year = {2015},
    volume = {65},
    number = {1},
    pages = {1--29},
    url = {https://www.jstatsoft.org/v65/i01/},
  }