Latin text of all Sulpicius' works by Halm (1866, still valuable), at Google Books.
Review of Philip Burton (ed.), Sulpicius Severus' 'Vita Martini'. Oxford: Oxford University Press, 2017. Pp. xiv, 298. ISBN 9780199676224.
Latin text of Chronica and Life of St. Martin (n.d.) at the Latin Library.
Testimonia, references to Sulpicius Severus in contemporary an medieval authors, collected in the Patrologia Latina, in Latin.
English translations (by Alexander Roberts, 1894) of all Sulpicius' Severus extant works, at Documenta Catholica Omnia, along with outdated Latin texts from the Patrologia Latina.
Roberts' translation, at the Christian Classics Ethereal Library. = Nicene and Post-Nicene Fathers, 2nd series, vol. 11, Sulpitius Severus, Vincent of Lerins, John Cassian, originally published in 1894.
Biography of Sulpicius Severus from the 11th edition of the Encyclopedia Britannica (1911)
Earlier version of this site, in Mediwiki (2010)
English Wikipedia article on Sulpicius Severus.
English Wikipedia article on St. Martin of Tours
French Wikipedia article on St. Martin of Tours