Ünal Akbulut, Emine Ceylan, and Mürvet Nevra Küpana. Beginner to Intermediate Introduction to Piano Timbre: NAVIGATING THE KEYS. Türkiye: Academician Publishing Book DOI Portal, 2023. Accessed July 15, 2026. https://omp35.books.akademisyen.net/index.php/akya/catalog/book/2631.