Books, Brochures, and Chapters>Book:  Bayliss , Sir William Maddock (1920), Principles of general physiology, Retrieved on 2012-01-04

Source Material [books.google.com]

Books, Brochures, and Chapters>Book:  Eliot , Lise (2000-10-03), What's Going on in There? : How the Brain and Mind Develop in the First Five Years of Life, Bantam, Retrieved on 2011-07-18