To cite package 'rdomains' in publications use:

Gaurav Sood (2018). rdomains: Classify Domains Based on Their Content. R package version 0.1.7.

Corresponding BibTeX entry:

  @Manual{,
    title = {rdomains: Classify Domains Based on Their Content},
    author = {Gaurav Sood},
    year = {2018},
    note = {R package version 0.1.7},
  }