1. Romeriscus, the oldest known reptile;Baird;Science,1967
2. The Age of the Dunkard. Proceedings of the First I. C. White Memorial Symposium;Barlow,1975
3. A small skull of the Lower Permian reptile Diadectes from the Washington Formation, Dunkard Group, West Virginia;Berman;Annals of Carnegie Museum,1971
4. Lower Permian vertebrate localities of New Mexico and their assemblages;Berman,1993
5. Broiliellus hektopos sp. nov. (Temnospodyli: Amphibia) Washington Formation, Dunkard Group, Ohio;Berman,1975