To cite quickpsy in publications use:

  Daniel Linares, Joan López-Moliner (2016). quickpsy: An R package to
  fit psychometric functions for multiple groups The R Journal, 8(1),
  122-131. URL hhttps://doi.org/10.32614/RJ-2016-008

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{quickpsy}: An R package to fit psychometric functions for multiple groups},
    author = {Daniel Linares and Joan López-Moliner},
    journal = {The R Journal},
    year = {2016},
    volume = {8},
    number = {1},
    pages = {122--131},
    url = {https://doi.org/10.32614/RJ-2016-008},
  }
