To cite medrxivr in publications use:

McGuinness LA, Schmidt L (2020). “medrxivr: Accessing and searching medRxiv and bioRxiv preprint data in R.” Journal of Open Source Software, 5(54), 2651. doi:10.21105/joss.02651, https://doi.org/10.21105/joss.02651.

Corresponding BibTeX entry:

  @Article{,
    title = {medrxivr: Accessing and searching medRxiv and bioRxiv
      preprint data in R},
    author = {Luke A. McGuinness and Lena Schmidt},
    journal = {Journal of Open Source Software},
    year = {2020},
    volume = {5},
    number = {54},
    pages = {2651},
    doi = {10.21105/joss.02651},
    url = {https://doi.org/10.21105/joss.02651},
  }