To cite PCovR in publications use:

Marlies Vervloet, Henk A. Kiers, Wim Van den Noortgate, Eva Ceulemans (2015). PCovR: An R Package for Principal Covariates Regression. Journal of Statistical Software, 65(8), 1-14. URL http://www.jstatsoft.org/v65/i08/.

Corresponding BibTeX entry:

  @Article{,
    title = {{PCovR}: An {R} Package for Principal Covariates
      Regression},
    author = {Marlies Vervloet and Henk A. Kiers and Wim {Van den
      Noortgate} and Eva Ceulemans},
    journal = {Journal of Statistical Software},
    year = {2015},
    volume = {65},
    number = {8},
    pages = {1--14},
    url = {http://www.jstatsoft.org/v65/i08/},
  }