Coen, G. (1933). Saggio di una Sylloge Molluscorum Adriaticorum. <em>Memorie del Regio Comitato Talassografico Italiano.</em> 192: i-vii, 1-186, pl. 1-10. page(s): 42, 162 [details]
MolluscaBase eds. (2024). MolluscaBase. Turritella communis var. extensa Coen, 1933. Accessed through: Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2024) European Register of Marine Species at: https://www.marbef.org/data/aphia.php?p=taxdetails&id=754548 on 2024-04-26
Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2024). European Register of Marine Species. Turritella communis var. extensa Coen, 1933. Accessed at: http://www.marbef.org/data/aphia.php?p=taxdetails&id=754548 on 2024-04-26
original descriptionCoen, G. (1933). Saggio di una Sylloge Molluscorum Adriaticorum. <em>Memorie del Regio Comitato Talassografico Italiano.</em> 192: i-vii, 1-186, pl. 1-10. page(s): 42, 162 [details]