1. Andres, D. (1977). Graptolithen aus ordovizischen Geschieben und die frühe Stammesgeschichte der Graptolithen. Paläontologische Zeitschrift 51 (1/2), 52-93.
2. Babcock, L. E., Peng, S. C., Wasserman, G. J., & Robison, R. A. (2011). Exceptionally preserved biota from a carbonate lithofacies, Huaqiao Formation (Cambrian: Drumian Stage), Hunan, China. Memoirs of the Association of Australasian Palaeontologists 42, 137-151.
3. Bates, D. E. B., & Urbanek, A. (2002). The ultrastructure, development, and systematic position of the graptolite genus Mastigograptus. Acta Palaeontologica Polonica 47(3), 445–458.
4. Bengtson, S., & Urbanek, A. (1986). Rhabdotubus, a Middle Cambrian rhabdopleurid hemichordate. Lethaia 19, 293-308.
5. Bouček, B. (1957). The dendroid graptolites of the Silurian of Bohemia. Rozpravy Ustredniho ustavu Geologickeho 23, 1-294, 39 pls.