The books listed here are ones that you are encouraged to read if you are becoming a doula.  They are also great for expectant parents and their support person.

The birth Book

The Birth Partner

The Doula Book

A Child is Born

The Thinking Woman's Guide to a Better Birth

The Complete book of Pregnancy

Pregnancy, Childbirth, & the Newborn

Conception, Pregnancy & Birth

An Easier Childbirth

Mothering the Mother

Easing Labor Pain

Gentle Birth Choices

Yoga for Pregnancy

Yoga for Pregnancy

A good Birth A Safe Birth

Having Twins and More

Ina May's Guide to Childbirth

Spiritual Midwifery

Labor Progress Handbook

When Survivors Give Birth

Obstetric Myths Vs Research Realities

The VBAC companion

Birthing from Within

Birthing from Within Keepsake Journal

Christ Centered Childbirth

The Lord of Birth