@book { UmweltbewutseinbeiJugendlichen,
    title = "Umweltbewußtsein bei Jugendlichen",
    author = "Gisela {Szagun} and Elke {Mesenholl} and Martina {Jelen}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1113865"
}