Siegelbaum, S.A., Clapham, D.E. and Marder, E. (2021) Modulation of Synaptic Transmission and Neuronal Excitability: Second Messengers. Chapter 14. IN: Principles of Neural Science, 6th edition, Kandel, E.R., Koester, J.D., Mack, S.H. and Siegelbaum, S.A., eds. McGraw Hill, New York.  pp. 301-323. ISBN: 9781259642234