TEICHERT, Curt. Part V, Graptolithina (Revised), Front Matter. Treatise on Invertebrate Paleontology, [S. l.], 1970. DOI: 10.17161/tip.v0i0.5408. Disponível em: https://journals.ku.edu/InvertebratePaleo/article/view/5408. Acesso em: 9 apr. 2025.