49ers–Cardinals rivalry - Wikipedia
San Francisco 49ers - Wikipedia
Cardinals vs. 49ers: Upcoming Game Info & Rivalry History - Ticketmaster Blog
Broncos-Seahawks rivalry, American Football Wiki
A narrative history of the 49ers-Saints rivalry - Niners Nation
Seahawks-49ers rivalry of old won't return, but this may start a new chapter - Seattle Sports
49ers-Seahawks rivalry, American Football Wiki
Rivalry recap: Cowboys vs. 49ers
Who Are the Arizona Cardinals' Biggest Rivals? - Sports Illustrated
Best of the San Francisco 49ers-Seattle Seahawks rivalry