Purves, Dale; Augustine, George J.; Fitzpatrick, David; Hall, William C.; LaMantia, Anthony-Samuel; Mooney, Richard D.; Platt, Michael L.; White, Leonard E. (2018) (på engelska). Neuroscience (6e internat. uppl.). New York, NY: Oxford University Press. sid. 206-207. Librisdn897w77bcxzf5mv. ISBN 9781605358413