@book { TeamofTeams,
    title = "Team of Teams",
    author = "Stanley {McChrystal} and Tantum {Collins} and David {Silverman} and Chris {Fussell} and Luitgard {Köster}",
    year = "2020",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1219118"
}