Material on caseinterviews:

Websites:
http://www.caseinterview.com
http://www.acethecase.com 
http://www.insideconsulting.com
http://masterthecase.com​

Books:
​Case in Point
Caseinterview Secrets
Ace the Case

Case resources online:
http://careers.bcg.com/join/practice_cases.aspx
http://www.joinbain.com/apply-to-bain/interview-preparation/
http://www.mckinsey.com/careers/join_us/interview_prep
http://www.consultingcase101.com/tag/free-sample-case/
http://cornelluniv.cqinteractive.com/cqiaccess/member_dashboard.cfm
https://www.youtube.com/user/caseinterview/videos?live_view=500&flow=list&sort=dd&view=0
https://mbaa.fuqua.duke.edu/socialimpact/documents/HBScaseguide.pdf​

Casebooks:
Wharton Casebook
Ross Casebook
Columbia Casebook
Chicago Casebook
Harvard Casebook
​Stern Casebook
​Darden Casebook
​Tuck Casebook
​Insead Casebook
​MIT Sloan Casebook