(of)Hagen, H. A. (1859). Additions au synopsis des Gomphines. <em>In: Edm. de Selys-Longchamps, Bull. Acad. Belg.</em> (2)7: 530-552.[details]
Traits (2021). Aphylla protracta (Hagen in Selys, 1859). Accessed at: https://marinespecies.org/traits/aphia.php?p=taxdetails&id=1459662 on 2025-05-30
Marine Species Traits editorial board (2025). Marine Species Traits. Aphylla protracta (Hagen in Selys, 1859). Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1459662 on 2025-05-30
original description(of)Hagen, H. A. (1859). Additions au synopsis des Gomphines. <em>In: Edm. de Selys-Longchamps, Bull. Acad. Belg.</em> (2)7: 530-552.[details]