In my practice I use and recommend Dr. Jack Newman and Teresa Pitman’s books on breastfeeding. These books have detailed descriptions of breastfeeding problems and practical advice on how to determine exactly what your problem is, along with suggestions as to how to address these problems.
Newman, Dr. Jack & Teresa Pitman. Dr. Jack Newman’s “Guide to Breastfeeding“, Harper Collins Publishers Ltd., Toronto, Revised edition (Feb 9 2009).
Newman, Jack, MD & Teresa Pitman. “The Latch and Other Keys to Breastfeeding Success“, Hale Publishing, Amarillo, Texas, 2006.