@book { ForschungsmethodeninderErziehungswissenschaft,
    title = "Forschungsmethoden in der Erziehungswissenschaft",
    author = "Gerhard W. {Schnaitmann}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097305"
}