View from the gated entrance of the cave looking outward.
Bretz, J. Harlen
1956 Caves of Missouri. Geological Survey and Water Resoures Department, Rolla (Missouri.
1993 The Petroglyphs and Pictographs of Missouri: A Distributional, Stylistic, Contextual, Functional and Temporal Analysis of the State's Rock Graphics. Ph.D. Dissertation, Department of Anthropology, Washington University , St. Louis, Missouri.
Diaz-Granados, Carol and James R. Duncan
2000 The Petroglyphs and Pictographs of Missouri. University of Alabama Press, Tuscaloosa.