To cite PRDA in publications use:

  Zandonella Callegher, C., Pastore, M., Andreella, A., Vesely, A.,
  Toffalini, E., Bertoldo, G., & Altoè G. (2020).  PRDA: Prospective
  and Retrospective Design Analysis (Version 1.0.0). Zenodo.
  https://doi.org/10.5281/zenodo.4044214

A BibTeX entry for LaTeX users is

  @Misc{,
    title = {PRDA: Prospective and Retrospective Design Analysis},
    author = {Claudio Zandonella Callegher and Massimiliano Pastore and Angela Andreella and Anna Vesely and Enrico Toffalini and Giulia Bertoldo and Gianmarco Altoè},
    year = {2020},
    publisher = {Zenodo},
    version = {1.0.0},
    doi = {10.5281/zenodo.4044214},
    url = {https://doi.org/10.5281/zenodo.4044214},
  }