JOGNN and 'Nursing for Women's Health' (both come with AWHONN membership) are great resources.
You also might want to consider Core Curriculum for Maternal Newborn Nursing by Mattson & Smith. It covers L/D, antepartum, newborn issues, and postpartum/breastfeeding. It's designed to be a study guide for the RNC certification exam in mother-baby but I use it a lot just as a reference. Hope this helps, and kudos to you for wanting to learn more!