The life and works of Potamius of Lisbon: a biographical and literary study with English translation and a complete commentary on the extant works of Potamius Epistula ad Athanasium, De Lazaro, De martyrio Isaiae Prophetae, Epistula de substantia, Epistula Potami
Pelayo on Potamius and Priscillian - Spanish Heterodox - p. 30 p. 33-34
A History of the Spanish Heterodox (2009)
Marcelino Menendez Pelayo
Opusculos desconocidos de San Jeronimo ;
This seems to pop up in 1908, again with little English explanation, not sure if there is even an English translation. It seems to be attributed to either Potamius or Jerome.
La Vetus Latina Hispana
Notice that this work has been ascribed to Jerome as well as Potamius
Altercatio ecclesiae et synagogae (1999)
. N. Hillgarth, Martino Conti
Epistula de substantia Patris et Filii et Spiritus Sancti.