"...τὠυτὸ γράμμα, τὸ Δωριέες μὲν σὰν καλέουσι ,Ἴωνες δὲ σίγμα" ('...the same letter, which the Dorians call "San", but the Ionians "Sigma"...'; Herodotus, Histories 1.139); cf. Nick Nicholas, Non-Attic lettersArchived 2012-06-28 at archive.today.
"...τὠυτὸ γράμμα, τὸ Δωριέες μὲν σὰν καλέουσι ,Ἴωνες δὲ σίγμα" ('...the same letter, which the Dorians call "San", but the Ionians "Sigma"...'; Herodotus, Histories 1.139); cf. Nick Nicholas, Non-Attic lettersArchived 2012-06-28 at archive.today.
unicode.org
Everson, Michael; Baker, Peter; Emiliano, António; Grammel, Florian; Haugen, Odd Einar; Luft, Diana; Pedro, Susana; Schumacher, Gerd; Stötzner, Andreas (30 January 2006). "L2/06-027: Proposal to add Medievalist characters to the UCS"(PDF). Archived(PDF) from the original on 19 September 2018. Retrieved 24 March 2018.
Everson, Michael; Baker, Peter; Emiliano, António; Grammel, Florian; Haugen, Odd Einar; Luft, Diana; Pedro, Susana; Schumacher, Gerd; Stötzner, Andreas (30 January 2006). "L2/06-027: Proposal to add Medievalist characters to the UCS"(PDF). Archived(PDF) from the original on 19 September 2018. Retrieved 24 March 2018.