Labour and delivery books

Britney • Husband and I are parents to two beautiful healthy boys!
I am looking for a good book on labour and delivery! I want something that is not written a million years ago and that might be a little lighter - not to graphic! Anyone have any suggestions? I'm a little sick of reading what to expect when your expecting. 
I just read Birth by Tina Cassidy which was a neat book about the evolution of birth! If anyone is looking for a good read.