@book { EthischeBeschaffung,
    title = "Ethische Beschaffung",
    author = "Johannes {Mosters}",
    year = "2011",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-00359-8",
    url = "https://www.peterlang.com/document/1044551"
}