I personally have all of these books and find them to have invaluable support and advice concerning attachment parenting issues.
Bumgarner, Norma Jane. Mothering Your Nursing Toddler.
Practical, supportive advice to extended breast feeding.
La Leche League. The Womanly Art of Breastfeeding, 7th edition. New York: Plume, 1997. ISBN 0-452-27908-9. [...]

Breastfeeding benefits include:
(But are not limited to)
* Breast milk is custom-made for your baby.
* Breastfed babies tend to be better disciplined.
* Breastfeeding helps get mom back in to shape.
* Breast milk provides valuable antibodies against disease.
* Nursing shows a marked decrease against ear infections.
* Breast fed babies have a higher IQ (anywhere from 8.3 [...]

What is Attachment Parenting? (Also called Instinctive Parenting or Primal Parenting)
Breast feeding Gentle discipline Child led Weaning Wearing your baby Holding your baby Sharing sleep (family bed) [...]