Руднєва, І. С., and О. М. Бугай. “Comparative Analysis of the English and German Modal Verbs”. The Journal of V.N. Karazin Kharkiv National University. Series: Foreign Philology. Methods of Foreign Language Teaching, no. 92, May 2021, pp. 92-98, doi:10.26565/2227-8877-2020-92-12.