@book { DieGanztagsschule, title = "Die Ganztagsschule", author = "Matthias Morten {Schöpa}", year = "2013", publisher = "Peter Lang Verlag", address = "Berlin, Germany", doi = "10.3726/978-3-653-03944-3", url = "https://www.peterlang.com/document/1048224" }