I used the above book for my Dragonair interview and found it a great help. Yes there are a few errors, some of them embarassing but in general the book is thorough and the author has done his homework on some actual questions that specific airlines ask.
Some other useful publications I found were the 'Prepare Yourself for Your Cathay Pacific Interview' and 'Prepare Yourself for Your Emirates Interview'. These included both sample multi choice and verbal questions both with answers and explanations.
Good Luck
The Cav