^Hamill, Robert W.; Shapiro, Robert E.; Vizzard, Margaret A. (2012-01-01), Robertson, David; Biaggioni, Italo; Burnstock, Geoffrey; Low, Phillip A. (eds.),
"Chapter 4 - Peripheral Autonomic Nervous System", Primer on the Autonomic Nervous System (Third Edition), San Diego: Academic Press, pp. 17–26,
ISBN978-0-12-386525-0, retrieved 2023-08-28