@book { SozialgeschichtlicheAspektedesGartensGardensinSocialHistory,
    title = "Sozialgeschichtliche Aspekte des Gartens- Gardens in Social History",
    author = "Walter {Gebhard}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093063"
}