I ordered my books from Amazon. Try these titles;
Ace the Technical Pilot Interview by Gary v. Bristow
Checklist for Success: A Pilot's Guide to the Successful Airline Interview (Professional Aviation series) (Professional Aviation series) by Cheryl A. Cage
Preparing for your Emirates interview by Captains X,Y and Z.
My favourite;
Airline Pilot Interviews: How You Can Succeed in Getting Hired /921T (Paperback)
by Irv Jasinski