Lu Yen-hao & Chang 1974. [Ordovician Trilobita.]. Nanking Institute of Geology Palaeontology, [Ed]. [A handbook of the stratigraphy and palaeontology in southwest China] Science Press, Academia Sinica, Peking. figs 1-66, pls l-202., l-454., 1974: 124-136. Chapter pagination: 124-136