Purves, Dale, George J. Augustine, David Fitzpatrick, William C. Hall, Anthony-Samuel LaMantia, James O. McNamara, and Leonard E. White (2008). Neuroscience. 4th ed. Sinauer Associates. ss. 122-6. ISBN978-0-87893-697-7.KB1 bakım: Birden fazla ad: yazar listesi (link)