«APRIL and the COMMA | English Project». www.englishproject.org. Besøkt 11. februar 2021. «In the 1490s, Aldus Manutius of Venice considered the comma question. The full stop had already arrived as the mark to end a sentence so a comma could not simply be a dot on the line, but, by the addition of a tail, Aldus gave the world a punctuation mark that the world has seen fit to keep. Aldus’s comma, sometimes called the ‘semicircular comma’, was a flexible and useful shape.»
«Kommaregler». Språkrådet. 4. mars 2015. Besøkt 28. juni 2017.
web.archive.org
Robert Bliss, Curmudgeon in Residence (1994). «Points to Ponder». CrossTalk: The Journal of Defensive Software Engineering,via Wayback Machine web.archive.org. U.S. Air Force Software Technology Support Center (STSC). Arkivert fra originalen 28. november 2002. Besøkt 11. februar 2021.CS1-vedlikehold: Uheldig URL (link)