The handbook published by Springer provides a comprehensive overview of the research field of recommender systems for technology enhanced learning (RecSysTEL). It aims to briefly introduce recommender systems and discuss issues related to their use for learning. The handbook serves as an overview of the work in this domain to help position new research and address those starting to study relevant topics. It makes the full bibliography covered available through an open Mendeley research group to connect readers to the community and contribute to the collection of new publications in this emerging field.