@book { AnwendungderPrinzipalAgentenTheorieaufSportsponsoringstrukturen,
    title = "Anwendung der Prinzipal-Agenten-Theorie auf Sportsponsoringstrukturen",
    author = "Usha {Singh}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/296791"
}