57 Percent of All Films Got R Rating in Last 50 Years, MPAA Says - TheWrap

MPAA marks the golden anniversary of its ratings system with a look back at its history

The Majority of Films Have Been Rated R Since the Inception of the MPAA — GeekTyrant

Reddibility/khandumpfile.sql at master · nicktomko/Reddibility · GitHub

Competition and product composition: Evidence from hollywood - ScienceDirect

Why are old TV shows and movies so corny? I tried to watch some 1950s and 60s shows but I just can't. - Quora

Film Ratings Celebrating 50 years

Dude, Where's My Car? (2000) - News - IMDb

List of highest-grossing films, Ultimate Pop Culture Wiki

Motion Picture Association, JH Movie Collection Wiki

Savoy Pictures/MPAA Rating Card (R, 1994)

Breaking Entertainment News and Analysis - Page 4670 of 13207 - TheWrap

Film-rating descriptors to add detail

The Texas Chain Saw Massacre - Wikiwand

R-rated movies hit lowest box office share in more than 25 years