Grey, Ian, Olive Healy, Geraldine Leader and Deirdre Hayes. 2009. "Using a Time Timer(TM) to increase appropriate waiting behavior in a child with developmental disabilities." Research in Developmental Disabilities 30(2):359-366.
Bakar, A. A., Liu, L., Conci, M., Elliott, M. A., & Ioannides, A. A. (2008). Visual field and task influence illusory figure responses. Human Brain Mapping, 29(11), 1313-1326.