Baron-Cohen, S., Allen, J., & Gillberg, C. (1992) Can autism be detected at 18 months? The needle, the haystack, and the CHAT. British Journal of Psychiatry, 161, 839-843.
Corkum, V. & Moore, C. (1998) The origins of joint visual attention in infants. Developmental Psychology, 34, 28-38.
Falck-Ytter, T., Fernell, E., Hedvall, A. L., von Hofsten, C., & Gillberg, C. (2012) Gaze performance in children with autism spectrum disorder when observing communicative actions. Journal of Autism and Developmental Disorders, 42, 2236-2245.