The Routledge Handbook of Language Learning and Technology, Edited by Fiona Farr, Liam Murray 2016.
This handbook contains recent work by authors read in the development of this bibliography. As an example, there is a chapter by Glenn Stockwell on Mobile Language Learning. See also this 20-minute video of Stockwell from a conference about mobile learning. In it, he describes three important aspects of MALL that are important for learners.
Mobile technology for language learning: Trends, issues and ways forward