ÉNAY, Raymond; HOWARTH, Michael K. Stevensites, Zittelites, and Gyrophylloceras, new generic names proposed for Stevensia Énay, 2009, Zittelia Tavera Benitez, 1985, and Gyrophyllites Wiedmann, 1963 (Mollusca: Ammonoidea). Paleontological Contributions, [S. l.], n. 19, p. 1–2, 2018. DOI: 10.17161/1808.26312. Disponível em: https://journals.ku.edu/paleocontributions/article/view/20298.. Acesso em: 5 may. 2024.