From One Single Mother to Another: Heart-Lifting Encouragement and Practical Advice by Aldrich, Sandra P. [Regal, 2005] (Paperback) Revised edition [Paperback]
I never found another book for single mom written by the widow. Being single-again has many similarities, yet there is a bunch of issues very specific for widows and divorcees. Sandra had a courage to write it honest from her own experience. Absolutely precious.
I wish if known ahead of time that it was written by a widow. It was worth reading, but I would have known not to hope for any insights on shared parenting.