P. Allen, James (2020). Coptic: A Grammar of Its Six Major Dialects. Penn State Press. стр. 1. ISBN9789042918108. „Coptic is the name of the final stage of the Egyptian language, spoken and written from the third century AD until perhaps sometime in the seventeenth century.”
The language may have survived in isolated pockets in Upper Egypt as late as the 19th century, according to James Edward Quibell, "When did Coptic become extinct?" in Zeitschrift für ägyptische Sprache und Altertumskunde, 39 (1901), p. 87. In the village of Pi-Solsel (Az-Zayniyyah or El Zenya north of Luxor), passive speakers were recorded as late as the 1930s, and traces of traditional vernacular Coptic reported to exist in other places such as Abydos and Dendera, see Werner Vycichl, Pi-Solsel, ein Dorf mit koptischer Überlieferung in: Mitteilungen des Deutschen Archäologischen Instituts, Abteilung Kairo, (MDAIK) vol. 6, 1936, pp. 169–175 (in German).
glottolog.org
Hammarström, Harald; Forkel, Robert; Haspelmath, Martin; Bank, Sebastian, ур. (2016). „Коптски”. Glottolog 2.7. Jena: Max Planck Institute for the Science of Human History.
Hammarström, Harald; Forkel, Robert; Haspelmath, Martin; Bank, Sebastian, ур. (2016). „Коптски”. Glottolog 2.7. Jena: Max Planck Institute for the Science of Human History.