To cite PCovR in publications use:

Vervloet M, Kiers HA, Van den Noortgate W, Ceulemans E (2015). “PCovR: An R Package for Principal Covariates Regression.” Journal of Statistical Software, 65(8), 1–14. doi:10.18637/jss.v065.i08.

Corresponding BibTeX entry:

    title = {{PCovR}: An {R} Package for Principal Covariates
    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},
    doi = {10.18637/jss.v065.i08},