To cite package ‘minimap’ in publications use:

  Kross S (2016). _minimap: Create Tile Grid Maps_. R package version
  0.1.0, <https://github.com/seankross/minimap>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {minimap: Create Tile Grid Maps},
    author = {Sean Kross},
    year = {2016},
    note = {R package version 0.1.0},
    url = {https://github.com/seankross/minimap},
  }