Glazunova L. 2019. Image of Hieracium laevigatum Willd. // Plantarium. Plants and lichens of Russia and neighboring countries: open online galleries and plant identification guide. URL: https://www.plantarium.ru/lang/en/page/image/id/625067.html (accessed on 30 Oct 2026).
Гербарий есть 
Основание стеблевого листа.