NWA National Heavyweight Championship Renders 1980-Present Day (credit to u/HexHellfire for the original renders) : r/WWEGames
The Chris Byrd story: From fighting in a nightclub to heavyweight champion of the world - mlive.com
DOCUMENTARY: A Timeline Of The 1980s Heavyweight Boxing Division - Boxing News
Muhammad Ali vs Larry Holmes - Heavyweight Championship Preview - Sports Illustrated - September 29, 1980 - Boxing - SI at Amazon's Sports Collectibles Store
Mohammad Ali Boxing Sports Illustrated Lot 1978 1980 Heavy Weight Champ | eBay
Late 1980's Larry Holmes Presentational WBC Heavyweight | Lot #59200 | Heritage Auctions
Round-Up: July 1980 | Project Territories
Sports Illustrated September 29, 1980 Heavyweight Champion Muhammad Ali | eBay
Top 5 Heavyweight Champions in the 1970s | A Brief Chronology of the 1970s Heavyweight Championship - YouTube
Top 5 Heavyweight Champions in the 1980s | A Brief Chronology of the 1980s Heavyweight Championship - YouTube
Notebook: WBC finally orders Fury vs. Whyte heavyweight title mandatory
Muhammad Ali and Larry Holmes World Heavyweight Championship boxing match poster October, 2 1980 Stock Photo - Alamy
And Then There Were Three - The Ring
Flashback: Muhammad Ali loses final world heavyweight title fight on this day in 1980