To cite gbifdb in publications use:

(2021). “Global Biodiversity Information Facility (GBIF) Species Occurrences.” https://registry.opendata.aws/gbif.

Corresponding BibTeX entry:

  @Misc{,
    title = {Global Biodiversity Information Facility (GBIF) Species
      Occurrences},
    year = {2021},
    url = {https://registry.opendata.aws/gbif},
  }