The history of the San Francisco 49ers starting 3-0 - Sactown Sports
San Francisco 49ers - Wikipedia
Jed York comps Joe Montana-Steve Young to Jimmy Garoppolo-Trey Lance
Super Bowl XXIII - Wikipedia
Greatest moment in 49ers Super Bowl history? That's an easy choice – The Mercury News
NFC Championship Game history: Wins, losses, results, teams
Season Recap: 1989 New York Giants
1989 San Francisco 49ers season, American Football Database
Most memorable 49er games of the decades