@book { CulturesofProgramPlanninginAdultEducation,
    title = "Cultures of Program Planning in Adult Education",
    subtitle = "Concepts, Research Results and Archives",
    author = "Bernd {Käpplinger} and Steffi {Robak} and Marion {Fleige} and Aiga {von Hippel} and Wiltrud {Gieseke}",
    year = "2017",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b11145",
    url = "https://www.peterlang.com/document/1049991"
}