Xia, G. Y.; Zhang, Z. C. (1985). Protozoa. In: 华北地区古生物图册(一)古生代分册 - Paleontological Atlas of North China (edited by Tianjin Institute of Geology and Mineral Resources) 1 (Paleozoic volume). Geological Publishing House, Beijing. 32-150.
336333
Xia, G. Y.; Zhang, Z. C.
1985
Protozoa. In: 华北地区古生物图册(一)古生代分册 - Paleontological Atlas of North China (edited by Tianjin Institute of Geology and Mineral Resources) 1 (Paleozoic volume)