Weiss, Mirin; Dr Steven M. Mirin; Dr Roxanne Bartel (1994). Cocaine. American Psychiatric Pub. p. 52. ISBN978-1-58562-138-5. Consultado el 26 de diciembre de 2008. Axons terminating on the postsynaptic cell body are axosomatic synapses. Axons that terminate on axons are axoaxonic synapses
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Rózsa M, Baka J, Bordé S, Rózsa B, Katona G, Tamás G (2015). «Unitary GABAergic volume transmission from individual interneurons to astrocytes in the cerebral cortex». Brain Structure and Function. PMID26683686. doi:10.1007/s00429-015-1166-9.
Zoli M, Torri C, Ferrari R (1998). «The emergence of the volume transmission concept». Brain Res. Brain Res. Rev.26 (2–3): 136-47. PMID9651506. doi:10.1016/S0165-0173(97)00048-9.
Rózsa M, Baka J, Bordé S, Rózsa B, Katona G, Tamás G (2015). «Unitary GABAergic volume transmission from individual interneurons to astrocytes in the cerebral cortex». Brain Structure and Function. PMID26683686. doi:10.1007/s00429-015-1166-9.