To cite capl in publications use:

Barnes JD, Guerrero MD (2021) An R Package for Computing Canadian Assessment of Physical Literacy (CAPL) scores and interpretations from raw data. PLoS ONE 16(2): e0243841. https://doi.org/10.1371/journal.pone.0243841

Corresponding BibTeX entry:

  @Article{,
    title = {An R Package for Computing Canadian Assessment of Physical
      Literacy (CAPL) scores and interpretations from raw data},
    author = {Joel D. Barnes and Michelle D. Guerrero},
    journal = {PLoS ONE},
    year = {2021},
    volume = {16},
    number = {2},
    pages = {e0243841},
    url = {https://doi.org/10.1371/journal.pone.0243841},
  }