алфавитно-цифровой знак . Raamatukogusõnastik. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//rara/%D0%B0%D0%BB%D1%84%D0%B0%D0%B2%D0%B8%D1%82%D0%BD%D0%BE-%D1%86%D0%B8%D1%84%D1%80%D0%BE%D0%B2%D0%BE%D0%B9%20%D0%B7%D0%BD%D0%B0%D0%BA/1/rus (21.06.2026)