@book { ContractManagementintheGermanITConsultingIndustry,
    title = "Contract Management in the German IT-Consulting Industry",
    author = "Boris Rolf {Dieter}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1100479"
}