@book { WorkshopNaturfotografievordereigenenHaustr,
    title = "Workshop Naturfotografie vor der eigenen Haustür",
    author = "Radomir {Jakubowski}",
    year = "2020",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/533847"
}