No-Drama Discipline, by Dan Siegel and (also) Tina Bryson. Very good breakdown of toddler and childhood emotions and how to handle them! I also keep meaning to read their other book, The Whole-Brain Child.
Anything by Dan Siegel is highly recommended (but I read those for work)
Crib Sheets by Emily Oster is worth a read
The Way of Play by Tina Bryson Shows the progression of play and its importance is social and emotional development