1. An, T.X., Zhang, F., Xiang, W.D., Zhang, Y.Q., Xu, W.H., Zhang, H.J., Jiang, D.B., Yang, C.S., Lin, L.D., Cui, Z.T., and Yang, X.C., 1983, The Conodonts of North China and the Adjacent Regions. Science Press, Beijing, 223 p. (in Chinese)
2. Bauer, J.A., 2010, Conodonts and conodont biostratigraphy of the Joins and Oil Creek formations, Arbuckle Mountains, south-central Oklahoma. Bulletin of the Oklahoma Geological Survey, 150, 44 p.
3. Bergström, S.M., 2007, Middle and Upper Ordovician conodonts from the Fågelsång GSSP, Scania, southern Sweden. GFF, 129, 77–82.
4. Bergström, S.M. and Ferretti, A., 2017, Conodonts in Ordovician biostratigraphy. Lethaia, 50, 424–439.
5. Bergström, S.M., Finney, S.C., Chen, X., Pålsson, C., Wang, Z.H., and Grahn, Y., 2000, A proposed global boundary stratotype for the base of the Upper Series of the Ordovician System: The Fågelsång section, Scandia, southern Sweden. Episodes, 23, 102–109.