@book { KognitiveEntwicklungdurchfunktionalesDenken,
    title = "Kognitive Entwicklung durch funktionales Denken",
    author = "Christoph {Kriesi}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1071072"
}