Backeljau, T.; Van Beeck, M. (1986). "Epiphallus anatomy in the Arion hortensis species aggregate (Mollusca, Pulmonata)". Zoologica Scripta. 15: 61–68. doi:10.1111/j.1463-6409.1986.tb00209.x. S2CID84574780.
Backeljau, T.; Van Beeck, M. (1986). "Epiphallus anatomy in the Arion hortensis species aggregate (Mollusca, Pulmonata)". Zoologica Scripta. 15: 61–68. doi:10.1111/j.1463-6409.1986.tb00209.x. S2CID84574780.