@book { PrincipalAgentProblematikimERecruitment,
    title = "Principal-Agent-Problematik im E-Recruitment",
    author = "Lennart {Piske}",
    year = "2011",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842815087",
    url = "https://m.diplom.de/document/228514"
}