We have invested a lot of time and effort in creating COVID-19 Data Hub, please cite the following when using it:

  Guidotti, E., Ardia, D., (2020), "COVID-19 Data Hub", Journal of Open
  Source Software 5(51):2376, doi: 10.21105/joss.02376.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {COVID-19 Data Hub},
    year = {2020},
    doi = {10.21105/joss.02376},
    author = {Emanuele Guidotti and David Ardia},
    journal = {Journal of Open Source Software},
    volume = {5},
    number = {51},
    pages = {2376},
  }

To retrieve citation and metadata of the data sources see ?covid19cite. To hide this message use 'verbose = FALSE'.