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sinauer.com
Purves, Dale; George J. Augustine; David Fitzpatrick; William C. Hall; Anthony-Samuel LaMantia; James O. McNamara; Leonard E. White (2008). Neuroscience (4th ed.). Sinauer Associates. pp. 834–5. ISBN978-0-87893-697-7. Archived from the original on 2007-12-07.[page needed]
Purves, Dale; George J. Augustine; David Fitzpatrick; William C. Hall; Anthony-Samuel LaMantia; James O. McNamara; Leonard E. White (2008). Neuroscience (4th ed.). Sinauer Associates. pp. 834–5. ISBN978-0-87893-697-7. Archived from the original on 2007-12-07.[page needed]