To cite psycho in publications use:

  Makowski, D. (2018). The Psycho Package: An Efficient and
  Publishing-Oriented Workflow for Psychological Science. Journal of
  Open Source Software, 3(22), 470. Available from
  https://github.com/neuropsychology/psycho.R

A BibTeX entry for LaTeX users is

  @Article{,
    title = {The Psycho Package: An Efficient and Publishing-Oriented Workflow for Psychological Science.},
    author = {Dominique Makowski},
    journal = {Journal of Open Source Software},
    volume = {3},
    number = {22},
    pages = {470},
    doi = {10.21105/joss.00470},
    year = {2018},
    note = {R package},
    url = {https://github.com/neuropsychology/psycho.R},
  }