R. Rated - Wikipedia

Rated R Hellsent

MPAA Ratings Are Not Curricular Guidelines - National Council of Teachers of English

Parents, Be Aware of ESRB Ratings

What do G, PG, PG-13, R, NC-17 movie ratings mean? - Quora

Earth Rated Plant Based Dog Wipes - Cleaning and Odor-Controlling Grooming Wipes for Paws, Body, and Butt - Perfect for Puppy and Adult Dogs - Lavender Scented - 100 Count

EXCLUSIVE: Terminator Salvation Originally Intended to be Rated R

How different film genres can be rated

R-rated movies – a rising flood

Machines take control of ESRB ratings – XBLAFans

The Hunchback of Notre Dame' at 25: 'The Most R-Rated G You Will Ever See' - The New York Times