Darby, F. and Lan, J.M. (2019). Small Teaching Online – Applying Learning Science in Online Classes. San Francisco: Jossey Bass.
This book follows Small Teaching – Everyday Lessons from the Science of Learning, but is focused exclusively on online learning (well, there are a great many blended learning observations here too). It is an American book – so the understanding of “online learning” is narrow, but they do focus on communities of inquiry, insightful suggestions for supporting struggling learners and how to increase student engagement.