@book { The501ruleWhattoconsiderbeforebuyingafootballclub,
    title = "The 50 + 1 rule: What to consider before buying a football club",
    author = "Max {Kindler}",
    year = "2014",
    publisher = "Anchor Academic Publishing",
    address = "Hamburg, Germany",
    url = "https://m.anchor-publishing.com/document/312706"
}