@book { Nonprofits,
    title = "Nonprofits",
    subtitle = "Analyse, Entwicklung und Rechtspolitik",
    author = "Jens {Maßmann}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095378"
}