To cite package 'FuncMap' in publications use:

Hanson BA (2018). FuncMap: Hive plots of R package function calls. R package version 1.0.10.

Corresponding BibTeX entry:

  @Manual{,
    title = {FuncMap: Hive plots of R package function calls},
    author = {Bryan A. Hanson},
    year = {2018},
    note = {R package version 1.0.10},
  }