Gilman, Alfred G, Melvin I Simon, Henry R Bourne, Bruce A Harris, Rochelle Long, Elliott M Ross, James T Stull, et al. (2002) 2002. “Overview of the Alliance for Cellular Signaling.”. Nature 420 (6916): 703-6.

Wingreen, Ned S, and Simon A Levin. (2006) 2006. “Cooperation Among Microorganisms.”. PLoS Biol 4 (9): e299.