To cite package ‘gridcol’ in publications use:

Sumner M (2017). gridcol: Gridded Vectors. R package version 0.0.0.9000, https://github.com/hypertidy/gridcol.

Corresponding BibTeX entry:

  @Manual{,
    title = {gridcol: Gridded Vectors},
    author = {Michael D. Sumner},
    year = {2017},
    note = {R package version 0.0.0.9000},
    url = {https://github.com/hypertidy/gridcol},
  }