BULMAN, O M.B. Part V, Graptolithina (Revised), Ch. 2, p. 49-95. Treatise on Invertebrate Paleontology, [S. l.], 1970. DOI: 10.17161/tip.v0i0.5410. Disponível em: https://journals.ku.edu/InvertebratePaleo/article/view/5410.. Acesso em: 21 nov. 2024.