History: Batman and Superman — Partners, Fighters, Bed Sharers

The Man of Steel sequel will feature DC Comic's most prominent superheroes. They've met many times before.

Super Sons Vol. 3: Parent Trap by Peter J. Tomasi: 9781401284466

Batman v. Superman: The Complete Story of How They Met (1945, 1952, 1958, 1970, 1972, 1986, 2003, 2004, 2008, 2011, 2013) – The Literary and Cinematic Time Machine

Taking the Batman out of the shadows

10 Things Only Comic Book Fans Know About Superman & Batman's Friendly Rivalry

A Better World, DC Animated Universe

Flash (Barry Allen) - Wikipedia

Superman (Comic Book) - TV Tropes

33 Crime-Fighting Batman Gifts That Every Caped Crusader Will Be Obsessed With

No caper: Bruce Wayne dethroned for armor-wearing Batman – Orange County Register

Batman vs Superman? Hell nah, Batman AND Superman : r/batman

Batman v Superman: Dawn of Justice, Warner Bros. Entertainment Wiki

DC New 52 - The Definitive Collecting Guide – Crushing Krisis