To cite rgeeExtra in publications use:

  C Aybar, Q Wu, L Bautista, R Yali and A Barja (2020) rgee: An R
  package for interacting with Google Earth Engine Journal of Open
  Source Software URL https://github.com/r-earthengine/rgeeExtra/.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {rgee: An R package for interacting with Google Earth Engine},
    author = {Cesar Aybar and Quisheng Wu and Lesly Bautista and Roy Yali and Antony Barja},
    journal = {Journal of Open Source Software},
    year = {2020},
  }