Jane Flint, Vincent R. Racaniello, Glenn F. Rall, and Anna Marie Skalka, Principles of Virology, ASM Press, 2015. Volume I on molecular biology, volume II on pathogenesis and control.

John Baez, Network Theory (part 3) , . Azimuth Blog. Includes tutorial examples material related on application of Petri nets to discrete infectious SI disease. and SIR models.

John C. Baez and Jacob Biamonte, Quantum techniques for stochastic mechanics, arXiv:1209.3632 [quant-ph]. Text includes treatment from the ground up of Petri nets, both stochastic and deterministic. Example includes SI, SIR and SIRS models.