1. AN, T.‐X. 1987.The Lower Palaeozoic conodonts of South China, 238Beijing: Peking University Publishing House. (in Chinese)
2. ANONYMOUS. An Excursion Guide to the Ordovician of Huanghuachang, Yichang, Hubei. Symposium on the Cambrian‐Ordovician and Ordovician‐Silurian Boundaries. October1983, Nanjing, China. Nanjing: Nanjing Institute of Geology and Palaeontology, Academia Sinica. (not numbered)
3. _____. 1988.Stratigraphic Excursion Guidebook in the Yangtze Gorges Area. Yichang Institute of Geology and Mineral Resources, 81Beijing: Geological Publishing House. (English translation)
4. Middle Ordovician acritarchs from the island of Odinsholm, Estonia