To cite pseval in publications use:

Sachs, C M, Gabriel, E E (2016). “An introduction to principal surrogate evaluation with the pseval package.” The R journal, 8(2), 277–292. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5774631/.

Corresponding BibTeX entry:

  @Article{,
    title = {An introduction to principal surrogate evaluation with the
      pseval package},
    author = {{Sachs} and Michael C and {Gabriel} and Erin E},
    journal = {The R journal},
    volume = {8},
    number = {2},
    pages = {277--292},
    year = {2016},
    publisher = {NIH Public Access},
    url = {https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5774631/},
  }