Board Thread:DC Universe Discussion/@comment-1038387-20121001081404/@comment-1038387-20121001093845

Year One wasn't as good as some other year ones. Unfortunately, it's the most recent "official" origin (pre-New 52). Earlier origins are in Justice League of America #9 (the Apple-laxatives) and Justice League of America #144. It became quite a mess, as Year One retcons out the big three as founders. However, this was again retconned in Meltzer's run (early Justice League of America Volume 2), which reuses the Silver Age team as founders.

For the Appellaxians, only Justice League of America #9 is recommended. Other League origins are Justice League: A New Beginning (the start of the JLI era), JLA: New World Order (the start of the JLA era) and, though it is an Elseword, Justice League: The New Frontier. Overall recommended reading for the Justice League is Identity Crisis (and to a lesser degree, Crisis of Conscience)