To cite package ‘read.gb’ in publications use:

  Mercier R (2021). _read.gb: Open GenBank Files_. R package version
  2.2, <https://CRAN.R-project.org/package=read.gb>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {read.gb: Open GenBank Files},
    author = {Robin Mercier},
    year = {2021},
    note = {R package version 2.2},
    url = {https://CRAN.R-project.org/package=read.gb},
  }