1. Albani, R.;Bagnoli, G.;Maletz, J. &Stouge, S. 2001. Integrated chitinozoan, conodont and graptolite biostratigraphy from the Upper Cape Cormorant Formation (Middle Ordovician), western Newfoundland. — Canadian Journal of Earth Sciences38: 387–409.
2. Archer, J.B. &Fortey, R.A. 1974. Ordovician graptolites from the Valhallfonna Formation, Northern Spitsbergen. — Special Papers in Palaeontology13: 87–97.
3. Benson, W.N. &Keble, R.A. 1935. The geology of the regions adjacent to Preservation and Chalky Inlets, Fjordland, New Zealand, 4. Stratigraphy and palaeontology of the fossiliferous Ordovician rocks. — Transactions of the Royal Society of New Zealand65: 244–294.
4. Boucek, B. &Pribyl, A. 1953. Taxonomie a kmenovy vyoj nekterych ordovickych graptolitu (Taxonomy and phylogeny of some Ordovician graptolites). — Bulletin International de l’Academie Tcheque des Sciences61 (20): 1–18.
5. Brongniart, A. 1828. Histoire des vegetaux fossils. — 488 p., Paris.