Kassai Ilona: Fonetika, published in 1998 by Nemzeti Tankönyvkiadó, is a foundational Hungarian academic textbook covering speech production, acoustics, and the Hungarian sound system. As a comprehensive, university-level resource, the text addresses both segmental and suprasegmental features, including intonation, rhythm, and articulatory processes. A digital version is maintained by ELTE (Eötvös Loránd University) for academic access. Eötvös Loránd Tudományegyetem Fonetika - EDIT (ELTE)