Beukelman, D. & Mirenda, P. (1998). Augmentative and Alternative Communication: Supporting Children and Adults with Complex Communication Needs, Third Edition
  Baltimore, MD: Paul H. Brookes Publishing Co.

This textbook provides a complete overview of Augmentative and Communication.  Specific chapters address all aspects of AAC assessment, implementation and evaluation of effectiveness.  In this text, Beukelman and Mirenda discuss levels of participation.  This concept helps teachers to develop a vision of the ways that a student who uses AAC can more fully participate.