Niners Biggest Playoff Upset! - MavoBooks
Dallas Cowboys fans, what do you think of the San Francisco 49ers, their fan base, and your rivalry with them especially during the 80s and 90s? - Quora
San Francisco 49ers History
Image Gallery of John Brodie
San Francisco 49ers - Wikiwand
San Francisco 49ers, American Football Database
Why do 49ers fans hate the Seahawks? Aren't the Cowboys and Raiders bigger enemies? - Quora
Dallas Cowboys fans, what do you think of the San Francisco 49ers, their fan base, and your rivalry with them especially during the 80s and 90s? - Quora
San Francisco 49ers - Wikiwand
San Francisco 49ers - Wikipedia
Quarterback John Brodie of the San Francisco 49ers rolls out to pass News Photo - Getty Images
49ers vs. Cowboys: 10 biggest moments in most storied NFL rivalry