1. Apollonov, M.K., Chugaeva, M.N. & Dubinina, S.V., 1984. Trilobites and Conodonts from the Batyrbay Section (Uppermost Cambrian-Lower Ordovician) in Malyi Karatau Range (Atlas of the Palaeontological Plates). Kazakh SSR Publishing House, Alma-Ata, 48 pp. (Russian)
2. Trilobite malformations and the fossil record of behavioral asymmetry
3. Chen, H.C. & Wu, Q.Q., 1989. Stratigraphic Memoir of Lower-Middle Yangtze Valley. Anhui Science and Technology Press, Hefei, 789 pp. (Chinese)
4. Feng, Z.Z., Peng, Y.M., Jin, Z.K., Jiang, P. L., Bao, Z.D., Luo, Z., Ju, T.Y., Tian, H. Q. & Wang, H., 2001. Cambrian and Ordovician Lithofacies and Palaeogeography of South China. Geological Publishing House, Beijing, 221 pp. (Chinese with English abstract)