"...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 5 November 2015 at the Wayback Machine.
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.
"...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 5 November 2015 at the Wayback Machine.
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.