Spiritual Midwifery - Ina May Gaskin
Ina May's Guide to Childbirth - Ina May Gaskin
The Birth Partner - Penny Simkin
The Complete Book of Pregnancy and Childbirth - Sheila Kitzinger
Gentle Birth Choices- Barbara Harper
Birthing From Within- Pam England & Rob Horowitz
Active Birth- Janet Balasskas
The Thinking Woman's Guide to A Better Birth- Henci Goer
Pregnancy, Childbirth and the Newborn - Simkin, Whalley & Keppler
Immaculate Deception II, Myth Magic & Birth - Suzanne Arms
The Birth of Hope - Jeane Rhodes, this book features a doula as a prominent character.
                             For more info: http://thebirthofhope.com/