Liao 1980. The Upper Permian brachiopods from western Guizhou. Qianxi diandong wan erdieshi hanmei diceng he gushengwuqun. [Stratigraphy and palaeontology of Upper Permian coal-bearing formation in western Guizhou and eastern Yunnan, China., Science Press, Peking, 1980: 123-194. Chapter pagination: 241-277