To cite bluertopo in publications use:

  Cordero E (2026). _bluertopo: Download and extract NOAA BlueTopo
  bathymetry with terra_. R package version 0.0.1,
  <https://el-cordero.github.io/bluer-topo/>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {bluertopo: Download and extract NOAA BlueTopo bathymetry with terra},
    author = {Elvin Cordero},
    year = {2026},
    note = {R package version 0.0.1},
    url = {https://el-cordero.github.io/bluer-topo/},
  }

  NOAA (2026). “BlueTopo.”
  <https://nauticalcharts.noaa.gov/data/bluetopo.html>.

A BibTeX entry for LaTeX users is

  @Misc{,
    title = {BlueTopo},
    author = {{NOAA}},
    year = {2026},
    url = {https://nauticalcharts.noaa.gov/data/bluetopo.html},
  }