@book { Textbook40FromPaperBasedTextbookswithDigitalComponentstoInteractiveTeachingandLearningEnvironments,
    title = "Textbook 4.0 – From Paper-Based Textbooks with Digital Components to Interactive Teaching and Learning Environments",
    author = "Almut {Ketzer-Nöltge} and Nicola {Würffel}",
    year = "2024",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b22145",
    url = "https://www.peterlang.com/document/1331548"
}