X-Men: Prelude To Schism
Format: paperback
ISBN:
9780785156901 (0785156909)
Publish date: March 14th 2012
Publisher: Marvel
Pages no: 112
Edition language: English
Series: X-Men Scisma
This is good background to the characters, but if you're already fairly familiar with them you don't need this to understand what Schism is. Though, it definitely is a good preface to the whole Schism series.