@book { PlayingtoWin,
    title = "Playing to Win",
    subtitle = "Wie Strategie wirklich funktioniert",
    author = "A. G. {Lafley} and Roger L. {Martin}",
    year = "2025",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1561400"
}