1. CH'ANG , L. C. 1933 Geology of the Chungking-Nanchuan Area. Contr. Geol. Dep. Sci. Inst. W. China 1 26 32
2. The Silurian Trilobites of New South Wales, with references to those of other parts of Australia;ETHERIDGE Jun.;The Encrinuridae. Proc. Linn. Soc. N. S. W.,1915
3. FLETCHER , T. W. 1850 Observations on Dudley Trilobites 6 404 405 pl. 32
4. Stratigraphy of China;GRABAU;Palaeozoic and older,19231924
5. Summary of the Faunas from the Sintan Shale;GRABAU;Bull. Geol. Surv. China,1926