NFL number changes: list of players who have switched jersey numbers
Micah Parsons wanted to be Agent Zero but won't be changing his jersey number for next season
Picking a jersey has uniform appeal among 49ers' players and fans
San Francisco 49ers roster: Offensive line continuity is key
49ers' Charvarius Ward takes up Colin Kaepernick's No. 7 jersey
Are some 49ers glad the season is now in Jimmy Garoppolo's hands?
49ers' abundance of retired numbers added to laundry list of problems – NBC Sports Bay Area & California
Eagles jersey number updates, including Landon Dickerson switching to No. 69 - Bleeding Green Nation
49ers news: Emmanuel Moseley is changing his number from 41 to No. 4 - Niners Nation
2 49ers change jersey numbers
The 49ers Bet Big on a Quarterback Upgrade but Ended Up Settling Anyway - The New York Times
Cowboys Doomed by Miscues Against 49ers' Defense - The New York Times
Why some NFL players switched to single-digit jersey numbers - Sports Illustrated