What's behind the number? 15 rookies explain why they chose their NFL uniform number - ESPN
NFL owners pass rule expanding eligible jersey numbers for certain positions
Best player by jersey number for 2022 NFL season – NBC Sports Boston
Top NFL players by jersey number: From Kyler Murray to Aaron Donald, a 1-99 ranking for the 2021 season
49ers reveal jersey numbers: Trey Lance is No. 5
Heritage Uniforms and Jerseys and Stadiums - NFL, MLB, NHL, NBA, NCAA, US Colleges: San Francisco 49ers Uniform and Team History
NFL rule proposal would allow more players to wear single-digit numbers like in college football
Study finds influence of smaller jersey numbers on perception - ESPN
49ers jersey numbers: Anthony Dixon retains No. 24, Nnamdi Asomugha issued No. 28 - Niners Nation
Philadelphia Eagles vs. San Francisco 49ers Preview
NFL jersey number changes: Why Dalvin Cook, Derwin James and other stars have new numbers for 2022 season
Super Bowl: Top 10 backstories to 49ers jersey numbers
Inside the 49ers: Can they please win Super Bowl to stop all this 1994 nostalgia? – Daily Democrat
49ers question of the day: You can only keep 3, 49ers' uniform edition - Niners Nation