To cite the covidcast package in publications use:

Arnold T, Bien J, Brooks L, Colquhoun S, Farrow D, Grabman J, Maynard-Zhang P, Reinhart A, Tibshirani R (2021). covidcast: Client for Delphi's COVIDcast Epidata API. R package version 0.4.2,

For information about citing the datasets provided by the API, see:

Corresponding BibTeX entry:

    title = {{covidcast}: Client for Delphi's COVIDcast Epidata API},
    author = {Taylor Arnold and Jacob Bien and Logan Brooks and Sarah
      Colquhoun and David Farrow and Jed Grabman and Pedrito
      Maynard-Zhang and Alex Reinhart and Ryan Tibshirani},
    year = {2021},
    note = {R package version 0.4.2},
    url = {},