Books as starting points:
The Crayfish: An Introduction to Zoology
(1879) by T. H. Huxley
Papers as starting points:
Serotonin and aggression: insights gained from a lobster model system and speculations on the role of amine neurons in a complex behavior
(2000) by Edward A. Kravitz. This is a recent and extensive review of the lobster model. It appears to be very similar to the crayfish model system.