Etienne and Beverly Wenger-Trayner are internationally renowned social learning theorists and consultants. Their pioneering writing and consulting is influential in diverse fields including learning theory, business, government, international development, healthcare, and education. 

They founded the Social Learning Lab to host events on theory, practice, and leadership. Their more recent writing updated the theory in Learning in landscapes of practice and in the first volume in their new book series: Learning to make a difference: value creation in social learning spaces. 

I can also highly recommend their Communities of practice guidebook as a really useful resource.

Bev and Etienne's website - https://www.wenger-trayner.com/

Communities of practice within and across organizations: A guidebook (2nd edition) - https://www.wenger-trayner.com/cop-guidebook/

Learning to make a difference: value creation in social learning spaces - https://www.wenger-trayner.com/learning-to-make-a-difference-book/