The Gridiron Uniform Database: A Head-to-Head History: The New York Giants and The San Francisco 49ers
Old Friends: Giants and Redskins Rivalry 1936-1946
Ranking the NFL's best rivalries: Where does Colts-Pats fit? - ESPN
San Francisco 49ers Rivals - Top 5 Bitter Feuds
NFL's top 10 divisional rivalries: Cowboys-Eagles, Packers-Bears battle for top spot on all-time list
Giants vs. 49ers: History of a playoff rivalry
NFL: New York Giants - 10 Greatest Games : Bill Parcells, Phil Simms: Movies & TV
NFL: The 49ers Used to Be a Given - WSJ
Cowboys vs. 49ers playoff history: From the first NFC championship to Troy Aikman vs. Steve Young
5 most memorable games in the Giants-Commanders rivalry - Big Blue View