Physoides Pan 1982

Pan 1982. Phylum Mollusca. Class Gastropoda. Xibei Diqu gu shengwu tuce: Shaan-Gan-Ning fence. [Paleontological atlas of Northwest China. Part 3. Mesozoic and Cenozoic], Geological Publishing House, Peking, 1982: 3-28. Chapter pagination: 28-52