buy these books:
Unassised Childbirth, by Laura Shanely
Childbirth Without Fear, by Grantly Dick-Read
Heart and Hands, by Elizabeth Davis
Spiritual Midwifery, By Ina May Gaskin
From browsing through the unassisted childbirth websites, I came across an interview with Laura Shanely. She had all four of her children unassisted, and these are the books she recommends.