Books that you may want to purchase to have on hand are:

Your training education will be more complete if you read each book.

Also while you are reading them, think about how it impacted you and how you intend to incorporate what you've learned in your doula practice. 

*The Doula Guide to Birth by Ananda Lowe

*The Birth Partner by Penny Simkin

*The Nursing Mother's Companion by Kathleen Huggins

*Ina May's Guide to Childbirth by Ina May Gaskin

*The Year After Birth bySheila Kitzinger

*Heart and Hands by Elizabeth Davis, Linda Harrison and Suzanne Arms

*You and Your Newborn Baby by Linda Todd

*Ended Beginnings: Healing Childbirth Losses by Claudia Panuthos

Pregnant Feelings: Developing Trust in Birth by Baldwin and Richardson

The Thinking Women's Guide to a Better Birth by Henci Goer

Homebirth in the Hospital by Stacey Marie Kerr MD

In Search of the Perfect Birth: A Journey from 

Hospital to Midwife to Unassisted by Elizabeth McKeown

Birthing the Elephant by Karen Abarbanel and Bruce Freeman (a fantastic business book)

This Time I Dance by Tama Kieves

Enjoy the reads!