International Handbook of Autism and Pervasive Developmental Disorders

From the reviews:

Johnny L. Matson
has spent his career as a researcher and academically involved in the training of doctoral level clinical psychologists specializing in developmental disabilities. He is the major professor of 48 Ph.D.s, many of whom have served as professors in major universities. He is founding editor and editor-in-chief of
Research in Autism Spectrum Disorders
and
Research in Developmental Disabilities.
He has authored over 600 publications, including 34 books and 16 tests. He previously served on the psychology and psychiatric faculties at the University of Pittsburgh. For the last 23 years he has been a professor at Louisiana State University. He is currently a Professor and Distinguished Research Master, and Director of Clinical Training in the Department of Psychology at Louisiana State University.

Peter Sturmey
is Professor of Psychology at Queens College and The Graduate Center, City University New York and a member of the Learning Processes and Behavior Analysis and Neuropsychology doctoral programs at City University of New York. He has published over 150 articles and 15 books on developmental disabilities. His current research focuses on applied behavior analysis and staff and parent training.