Nielsen, I. (1990). Thermae et balnea. 2 Vol. Viborg
Shackleton Bailey, David Roy (Ed.). (2004). Cicero’s letters to Atticus. Vol. VI, 44 B.C., 355-426 (books XIV-XVI). Cambridge University Press.
Jal, Paul (1984) Abrégés des livres de l’Histoire Romaine de Tite-Live, tome XXXIV, 1re partie: «Periochae» transmises par les manuscrits (Periochae 1–69), Paris, Les Belles Lettres.
A research website about Archaeology of Ancient Roman Thermalism — and a meeting point for researchers and other people interested in this subject (Red Termal).