Sources:

"Autism at 70 — Redrawing the Boundaries"
Jeffrey P. Baker, M.D., Ph.D. September 19, 2013
N Engl J Med 2013; 369:1089-1091
Link: http://www.nejm.org/doi/full/10.1056/NEJMp1306380

"History of Autism"
Link: http://www.webmd.com/brain/autism/history-of-autism

Link: http://sfari.org/news-and-opinion/classic-paper-reviews/2007/leo-kanners-1943-paper-on-autism-commentary-by-gerald-fischbach