1. Bomberger J.(2020).Passenger pigeon hunting in northwestern Pennsylvania. M.A. thesis. Indiana Pennsylvania: Indiana University of Pennsylvania
2. From gizzards to gastroliths: Early to mid‐Holocene intensive harvest and processing of migratory waterfowl at a Carolina bay in the upper coastal plain of South Carolina;Brooks M. J.;Legacy,2012
3. Gastroliths;Brown B.;Science,1907
4. Wind‐worn stones or ventifacts—A discussion and bibliography;Bryan K.;Reprint and Circular Series National Research Council [Report on Sedimentation 1929‐1930],1931