To cite package ‘BioThingsClient.R’ in publications use:

  Johnson T, Wu C (2020). _BioThingsClient.R: BioThings Client
  (https://github.com/biothings/BioThingsClient.R)_. R package version
  0.99.1, <https://github.com/biothings/biothingsclient.r>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {BioThingsClient.R: BioThings Client
(https://github.com/biothings/BioThingsClient.R)},
    author = {Thomas Johnson and Chunlei Wu},
    year = {2020},
    note = {R package version 0.99.1},
    url = {https://github.com/biothings/biothingsclient.r},
  }