References:
Beck, A., and C. C. Labandeira. 1998. Early Permian insect folivory on a giganitopterid-dominated riparian flora from north-central Texas. Palaeogeography, Palaeoclimatology, Palaeoecology 142 (3/4):139–173

Behrensmeyer, A. K., J. D. Damuth, W. A. DiMichele, R. Potts, H.-D. Sues, and S. L. Wing. 1992. Terrestrial Ecosystems through Time: Evolutionary Paleoecology of Terrestrial Plants and Animals. Chicago: University of Chicago Press. 568 pp.

Carroll, Robert. 1988. Vertebrate Paleontology and Evolution. New York: Freeman and Company.

Labandeira, C. C. 1997. Permian pollen eating. Science 277:1422–1423.

Labandeira, C. C. 1998. Early history of arthropod and vasular plant association. Annual Review of Earth and Planetary Sciences 26:329–377.

Links:
Department of Paleobiology Life of a Vertebrate Fossil http://paleobiology.si.edu/LVF/index.htm