Birth Partners:
The Birth Partner: A Complete Guide to Childbirth for Dads, Doulas and All Other Labor Companions by Penny Simkin. This book has practical explanations for those assisting your labor, helpful lists, and clear language. If your only experience with birth is from mainstream media, this helps to define the entire process in a more accurate light. I think every birth can benefit from the assistance of a doula, but if your partner finds this book difficult to read or you doesn't have time to read it, you definitely need to consider using a birth doula.

Real Stories of Natural Birth:
Ina May's Guide to Childbirth by Ina May Gaskin. If you would like more information about home birth, or if you have a family member who is concerned about the safety of home birth or your birth choices, this is a great option. The first half of the book describes more than 100 home births that Ina May has attended over the years and encompasses the vast range of normal births. The second half describes the different stages of labor, pros and cons of interventions, and practical tips for a great birth.

For Moms with Previous Trauma, Fears, or an Interest in the Art of Birth
Birthing from Within: An Extraordinary Guide to Childbirth Preparation by Pam England and Rob Horowitz. This book is written with many exercises and workbook exercises. In my opinion, moms who have a history of trauma and abuse should use this book with the support of a therapist. Those without a history of trauma may find the exercises help them address the preconceptions they have about labor and delivery.