Trace fossils—trackways, nesting sites, and gastroliths (stomach stones)—offer a unique window into behavior. Herd structures, parental care, and feeding strategies are all inferred through comparative biology. PDFs covering theropod trackways from the Jurassic coast are goldmines for behavioral evidence.
This is the encyclopedia. At over 1,100 pages, it is intimidating but exhaustive. It covers everything from taphonomy (how fossils form) to dinosaur art history.
: For a higher-level summary of dinosaur groups and facts, the University of Cincinnati's "Dinosaurs" PDF
Beyond the Grave: Advances in Dinosaur Paleobiology and the Reconstruction of Mesozoic Ecosystems
The story of dinosaur paleobiology is the transformation of dinosaurs from "monsters" in our imagination to living, breathing organisms that dominated Earth for over 160 million years