Hall, J. (1879). Natural history of New York. Geological Survey of New York. <em>Palaeontology.</em> vol. 5, part 2. Van Benthuysen, Albany. xv + 492 pp., 113 pls.[details]
MolluscaBase eds. (2024). MolluscaBase. Bellerophon helena Hall, 1879 †. Accessed at: https://www.molluscabase.org/aphia.php?p=taxdetails&id=1759338 on 2024-07-05
original descriptionHall, J. (1879). Natural history of New York. Geological Survey of New York. <em>Palaeontology.</em> vol. 5, part 2. Van Benthuysen, Albany. xv + 492 pp., 113 pls.[details]