Despite the advent of the kindle and e-books, educational books are still best bought in paper. Here is my recommendation to support your own research and development.
Evidence Based Teaching by Geoff Petty
"...Evidence Based Teaching is for teachers with some experience. It makes use of the most rigorous research on what has the biggest impact on achievement, and shows how to use this in your teaching..." from the EBT website
Geoff Petty analyses the collection of research by Marzano from America and John Hattie from New Zealand in terms of the effect on learning. You will be surprised as some common myths are shown to be not so relevant (class size, finance etc) and less surprised at the methods that are the most effective.
This book also looks at how to make best use of these methods and further how to conduct evidence based research in your own classroom so that you improve the learning of the your children. For anyone with a thirst for more educational insight. Easy to access and understand. This is a must for anyone's educational library.